Wikipedia

RDNA 3

This is an old revision of this page, as edited by JmsDoug (talk | contribs) at 16:05, 8 April 2023 (→Chiplet packaging). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

RDNA 3 is a GPU microarchitecture designed by AMD, released with the Radeon RX 7000 series on December 13, 2022.

RDNA 3
LaunchedDecember 13, 2022; 23 months ago (2022-12-13)
Designed byAMD
Manufactured by
Fabrication process
Codename(s)
  • Plum Bonito
  • Wheat Nas
  • Hotpink Bonefish
Product Series
Desktop
Specifications
Compute
  • 122.8 TFLOPS (FP16)
  • 61.42 TFLOPS (FP32)
  • 1.919 TFLOPS (FP64)
Clock rate1500 MHz to 2500 MHz
Shader clock rate2269 MHz
L0 cache64 KB (per WGP):
  • 32 KB instructions cache
  • 16 KB K data cache
L1 cache256 KB (per array)
L2 cache6 MB
L3 cacheup to 192 MB
Memory supportGDDR6
Memory clock rate20 Gbps
PCIe supportPCIe 4.0
Supported Graphics APIs
DirectXDirectX 12 Ultimate (12.2)
Direct3DDirect3D 12
Shader ModelShader Model 6.7
OpenCLOpenCL 2.1
OpenGLOpenGL 4.6
VulkanVulkan 1.3
Media Engine
Encode codecs
Decode codecs
Color bit-depth
  • 8-bit
  • 10-bit
  • 12-bit
Encoder(s) supported
  • AMF
  • VCE
Display outputs
History
PredecessorRDNA 2
VariantCDNA 3 (datacenter)
SuccessorRDNA 4

Background

On June 9, 2022, AMD held their Financial Analyst Day where they presented a client GPU roadmap which contained mention of RDNA 3 coming in 2022 and RDNA 4 coming in 2024.[1] AMD announced to investors their intention to achieve a performance-per-watt uplift of over 50% with RDNA 3 and that the upcoming architecture would be built using chiplet packaging on a 5nm process.[2]

A sneak preview for RDNA 3 was included towards the end of AMD's Ryzen 7000 unveiling event on August 29, 2022. The preview included RDNA 3 running gameplay of Lies of P, AMD CEO Lisa Su confirming that a chiplet design would be used, and a partial look at AMD's reference design for an RDNA 3 GPU.[3]

Full details for the RDNA 3 architecture were unveiled on November 3, 2022 at an event in Las Vegas.[4]

Architectural details

Chiplet packaging

For the first time ever in a consumer GPU, RDNA 3 utilizes modular chiplets. AMD previously had great success with its use of chiplets in its Ryzen desktop and Epyc server processors.[5]

The decision to move to a chiplet-based GPU microarchitecture was led by AMD Senior Vice President Sam Naffziger who had also lead the chiplet initiative with Ryzen and Epyc.[6] The development of RDNA 3's chiplet architecture began towards the end of 2017 with Naffziger leading the AMD graphics team in the effort.[7]

Memory Cache Dies (MCDs)

With a respective 2.05 billion transistors, each Memory Cache Die (MCD) contains large blocks of L3 cache and two physical 32-bit GDDR6 memory interfaces for a combined 64-bit interface per MCD.[8] The Radeon RX 7900 XTX has a 384-bit memory bus through the use of six MCDs while the RX 7900 XT has a 320-bit bus due to its five MCDs.

Chiplet interconnects

The chiplet interconnects have a bandwidth of 5.3 TB/s.[9]

Process node

According to Naffziger, cache and SRAM do not scale as linearly as logic does on advanced nodes like N5 in terms of density and power consumption so they can instead be fabricated on the cheaper, more mature N6 node. The use of smaller chiplet dies rather than one large monolithic die is beneficial for maximizing wafer yields as more dies can be fitted onto a single wafer.[7]

Compute Units

RDNA 3 contains up to 96 graphics Compute Units that can provide up to 61 TFLOPS of compute.[10]

RDNA 3 has dedicated AI acceleration which can improve AI-based performance by 2.7x and also benefits ray tracing instructions, similar to Nvidia's Tensor cores.[10]

Ray tracing

Each RDNA 3 Compute Unit contains one ray tracing accelerator. The overall number of ray tracing accelerators is increased due to the higher number of Compute Units, though the number of ray tracing accelerators per Compute Unit has not increased over RDNA 2.

Clock speeds

RDNA 3 was designed to support high clock speeds On RDNA 3, clock speeds have been decoupled with the front end operating at a 2.5 GHz frequency while the shaders operate at 2.3 GHz. The shaders operating at a lower clock speed gives up to 25% power savings accrding to AMD and RDNA 3's shader clock speed is still 15% faster than RDNA 2.[11]

German overclocker Der8auer overclocked a liquid cooled PowerColor RX 7900 XTX Liquid Devil model to 3.4 GHz with a power draw of 650W compared to the standard 2.5 GHz boost clock of the RX 7900 XTX.[12][13]

Cache and memory subsystem

RDNA 3 GPUs use GDDR6 memory rather than faster GDDR6X due to the latter's increased power consumption.

16 MB Infinity Cache is included on each MCD

Theoretically, additional L3 cache could be added to the MCDs via AMD's 3D V-Cache die stacking technology as the MCDs contain unused TSV connection points.[14][15]

Power efficiency

AMD claims that RDNA 3 achieves a 54% increase in performance-per-watt which is in line with their previous claims of 50% performance-per-watt increases for both RDNA and RDNA 2.

Media engine

RDNA 3 is the first RDNA archtecture to have a dedicated media engine. It is built into the GCD called the Radiance Display Engine. AMD's AMF AV1 encoder is comparable in quality to Nvidia's NVENC AV1 encoder but can handle a higher number of simultaneous encoding streams compared to the limit of 3 on the GeForce RTX 40 series.[16]

Supported encoding frame rates
H.264 H.265 AV1 Ref.
1080p [17]
1440p
4K 180 180 240
8K 48 48 60

AMD touted RDNA 3's support for DisplayPort 2.1 UHBR 13.5, delivering up to 54 Gbit/s bandwidth for high refresh rates at 4K and 8K resolutions.[18] Displayport 2.1 can support 4K at 480 Hz and 8K at 165 Hz with Display Stream Compression (DSC). The previous Displayport 1.4 standard with DSC was limited to 4K at 240 Hz and 8K at 60 Hz.


Graphics Compute Die
(GCD) 		Memory Cache Die
(MCD)
Navi 31 Navi 32 Navi 33
Ref.
Launch Dec 2022 Jan 2023 Dec 2022
Codename Plum Bonito Wheat Nas Hotpink Bonefish —
Compute units
(Stream processors)
[FP32 cores] 		96
(6144)
[12288] 		60
(3840)
[7680] 		32
(2048)
[4096]
Process TSMC N5 TSMC N6
Transistors 45.7B 13.3B 2.05B
Transistor density 152.3 MTr/mm2 62.5 MTr/mm2 55.4 MTr/mm2
Die size 300 mm2 204 mm2 37 mm2
Max TDP 405 W 300 W 200 W —
Products Desktop
  • RX 7900 XT
  • RX 7900 XTX
Mobile
  • RX 7600S
  • RX 7600M
  • RX 7600M XT
  • RX 7700S


Products

Desktop

Model
(Code name) 		Release Date
& Price 		Architecture
& fab 		Chiplets Transistors
& die size[i] 		Core Fillrate[ii][iii][iv] Processing power[ii][v]
(TFLOPS) 		Infinity Cache Memory TBP Bus
interface
Config[vi] Clock[ii]
(MHz) 		Texture
(GT/s) 		Pixel
(GP/s) 		Half Single Double Size Bandwidth
(GB/s) 		Size Bandwidth
(GB/s) 		Bus type
& width 		Clock
(MT/s)

Radeon RX 7600
(Navi 33)[19] 		May 25, 2023
$269 USD 		RDNA 3
TSMC N6 		Monolithic 13.3×109
204 mm2 		2048:128:64:32:64
32 CU 		1720
2655 		220.2
339.8 		110.1
169.9 		28.18
43.50 		14.09
21.75 		0.440
0.680 		32 MB 476.9 8 GB 288 GDDR6
128-bit 		18000 165 W PCIe 4.0
×8
Radeon RX 7600 XT
(Navi 33)[20][21] 		Jan 24, 2024
$329 USD 		1720
2755 		220.2
352.6 		110.1
176.3 		28.18
45.14 		14.09
22.57 		0.440
0.705 		16 GB 190 W
Radeon RX 7700 XT
(Navi 32)[22] 		Sep 6, 2023
$449 USD 		RDNA 3
TSMC N5 (GCD)
TSMC N6 (MCD) 		1 × GCD
3 × MCD 		28.1×109
346 mm2 		3456:216:96:54:108
54 CU 		1900
2544 		410.4
549.5 		182.4
244.2 		52.53
70.34 		26.27
35.17 		0.821
1.099 		48 MB 1995 12 GB 432 GDDR6
192-bit 		245 W PCIe 4.0
×16
Radeon RX 7800 XT
(Navi 32)[23] 		Sep 6, 2023
$499 USD 		1 × GCD
4 × MCD 		3840:240:96:60:120
60 CU 		1800
2430 		432
583.2 		172.8
233.2 		55.30
74.65 		27.64
37.32 		0.864
1.166 		64 MB 2708 16 GB 624 GDDR6
256-bit 		19500 263 W
Radeon RX 7900 GRE
(Navi 31)[24] 		Jul 27, 2023
China only,
Feb 27, 2024
$549 USD 		57.7×109
529 mm2 		5120:320:192:80:160
80 CU 		1270
2245 		406.4
718.4 		243.8
431.0 		52.02
91.96 		26.01
45.98 		0.813
1.437 		2250 576 18000 260 W
Radeon RX 7900 XT
(Navi 31)[25] 		Dec 13, 2022
$899 USD 		1 × GCD
5 × MCD 		5376:336:192:84:168
84 CU 		1500
2400 		504.0
806.4 		288.0
460.8 		64.51
103.2 		32.26
51.61 		1.008
1.613 		80 MB 2900 20 GB 800 GDDR6
320-bit 		20000 315 W
Radeon RX 7900 XTX
(Navi 31)[26] 		Dec 13, 2022
$999 USD 		1 × GCD
6 × MCD 		6144:384:192:96:192
96 CU 		1900
2500 		729.6
960.0 		364.8
480.0 		93.39
122.9 		46.69
61.44 		1.459
1.920 		96 MB 3500 24 GB 960 GDDR6
384-bit 		355 W
  1. ^ Approximate die size of all active dies (one GCD and up to six MCD).[27]
  2. ^ a b c Boost values (if available) are stated below the base value in italic.
  3. ^ Texture fillrate is calculated as the number of Texture Mapping Units multiplied by the base (or boost) core clock speed.
  4. ^ Pixel fillrate is calculated as the number of Render Output Units multiplied by the base (or boost) core clock speed.
  5. ^ Precision performance is calculated from the base (or boost) core clock speed based on a FMA operation.
  6. ^ Unified shaders : Texture mapping units : Render output units : Ray accelerators : AI accelerators and Compute Units (CU)

Mobile

Model
(Code name) 		Release
date 		Architecture
& fab 		Chiplets Transistors
& die size 		Core Fillrate[a][b][c] Processing power[a][d]
(TFLOPS)[e] 		Infinity
Cache 		Memory TDP Interface
Config[f] Clock[a]
(MHz) 		Texture
(GT/s) 		Pixel
(GP/s) 		Half Single Double Size Bandwidth
(GB/s) 		Bus type
& width 		Clock
(MT/s)

Radeon RX 7600S
(Navi 33)[28] 		Jan 4, 2023 RDNA 3
TSMC N6 		Monolithic 13.3×109
204 mm2 		1792:112:64:28:56
28 CU 		1500
2200 		168.0
246.4 		96.00
140.8 		21.50
31.54 		10.75
15.77 		0.336
0.493 		32 MB 8 GB 256 GDDR6
128-bit 		16000 75 W PCIe 4.0
×8
Radeon RX 7600M
(Navi 33)[29] 		1500
2410 		168.0
269.9 		96.0
154.2 		21.50
34.55 		10.75
17.28 		0.336
0.540 		90 W
Radeon RX 7600M XT
(Navi 33)[30] 		2048:128:64:32:64
32 CU 		1500
2615 		192.0
334.1 		96.00
167.0 		24.58
42.84 		12.29
21.42 		0.384
0.669 		288 18000 120 W
Radeon RX 7700S
(Navi 33)[31] 		1500
2500 		192.0
320.0 		96.0
160.0 		24.58
40.96 		12.29
20.48 		0.384
0.640 		100 W
Radeon RX 7800M
(Navi 33)[32] 		Sep 11, 2024 28.1×109
346 mm2 		3840:240:96:60:120

60 CU


2145
560.4 		?
71.73
35.87
1.204 		48 MB 12 GB 432 GDDR6

192-bit

180 W ?
Radeon RX 7900M
(Navi 31)[33] 		Oct 19, 2023 RDNA 3
TSMC N5 (GCD)
TSMC N6 (MCD) 		1 × GCD
4 × MCD 		57.7×109
529 mm2 		4608:288:192:72:144
72 CU 		1825
2090 		525.6
601.9 		350.4
401.3 		67.28
77.05 		33.64
38.52 		1.051
1.204 		64 MB 16 GB 576 GDDR6
256-bit 		PCIe 4.0
×16
  1. ^ a b c Boost values (if available) are stated below the base value in italic.
  2. ^ Texture fillrate is calculated as the number of Texture Mapping Units multiplied by the base (or boost) core clock speed.
  3. ^ Pixel fillrate is calculated as the number of Render Output Units multiplied by the base (or boost) core clock speed.
  4. ^ Precision performance is calculated from the base (or boost) core clock speed based on a FMA operation.
  5. ^ GPUs based on RDNA 3 have dual-issue stream processors so that up to two shader instructions can be executed per clock cycle under certain parallelism conditions.
  6. ^ Unified shaders : Texture mapping units : Render output units : Ray accelerators : AI accelerators and Compute units (CU)

Integrated graphics processors (iGPs)

Model Launch Codename Architecture
& fab 		Chiplets Die
size 		Core Fillrate[a][b][c] Processing power[a][d]
(GFLOPS) 		Cache TDP Bus
interface
Config[e][f] Clock[a]
(MHz) 		Texture
(GT/s) 		Pixel
(GP/s) 		Half Single Double L0 L1 L2
760M Apr 2023 Phoenix RDNA 3
TSMC N4 		178 mm2 6 CU
384:24:16:6 		1500
2800 		96 KB  KB 2 MB 15 W PCIe 4.0
×8
780M 12 CU
768:48:32:12 		1500
2900 		192 KB  KB
  1. ^ a b c Boost values (if available) are stated below the base value in italic.
  2. ^ Texture fillrate is calculated as the number of Texture Mapping Units multiplied by the base (or boost) core clock speed.
  3. ^ Pixel fillrate is calculated as the number of Render Output Units multiplied by the base (or boost) core clock speed.
  4. ^ Precision performance is calculated from the base (or boost) core clock speed based on a FMA operation.
  5. ^ Unified shaders : Texture mapping units : Render output units : Ray accelerators and Compute units (CU)
  6. ^ GPUs based on RDNA 3 have dual-issue stream processors so that up to two shader instructions can be executed per clock cycle under certain parallelism conditions.


References

  1. ^ Smith, Ryan (June 9, 2022). "AMD's 2022-2024 Client GPU Roadmap: RDNA 3 This Year, RDNA 4 Lands in 2024". AnandTech. Retrieved April 8, 2023.
  2. ^ Walton, Jarred (June 9, 2022). "AMD GPU Roadmap: RDNA 3 With 5nm GPU Chiplets Coming This Year". Tom's Hardware. Retrieved April 8, 2023.
  3. ^ Wickens, Katie (August 31, 2022). "AMD's Lisa Su confirms chiplet-based RDNA 3 GPU architecture". PC Gamer. Retrieved April 8, 2023.
  4. ^ "AMD Unveils World's Most Advanced Gaming Graphics Cards, Built on Groundbreaking AMD RDNA 3 Architecture with Chiplet Design". AMD (Press release). Las Vegas, NV. November 3, 2022. Retrieved April 8, 2023.
  5. ^ James, Dave (June 24, 2022). "AMD suggests a Ryzen-like design for RDNA 3 chiplets would be 'a reasonable inference'". PC Gamer. Retrieved April 8, 2023.
  6. ^ Alcorn, Paul; Walton, Jarred (June 23, 2022). "Into the GPU Chiplet Era: An Interview With AMD's Sam Naffziger". Tom's Hardware. Retrieved April 8, 2023.
  7. ^ a b Brosdahl, Peter (November 22, 2022). "AMD Lead Engineer Sam Naffziger Explains Advantages of RDNA3 Chiplet Design". The FPS Review. Retrieved April 8, 2023.
  8. ^ Walton, Jarred (November 14, 2022). "AMD RDNA 3 GPU Architecture Deep Dive: The Ryzen Moment for GPUs". Tom's Hardware. Retrieved April 8, 2023.
  9. ^ "AMD Explains the Economics Behind Chiplets for GPUs". TechPowerUp. November 14, 2022. Retrieved April 8, 2023.
  10. ^ a b Gula, Damien (November 3, 2022). "AMD's RDNA 3 GPUs are Way Cheaper Than the RTX 4090". Gizmodo. Retrieved April 8, 2023.
  11. ^ Olšan, Jan (November 7, 2022). "AMD RDNA 3 details: architecture changes, AI acceleration, DP 2.1". HWCooling. Retrieved April 8, 2023.
  12. ^ Shilov, Anton (March 24, 2023). "PowerColor Radeon RX 7900 XTX Overclocked to 3.25 GHz on LCS". Tom's Hardware. Retrieved April 8, 2023.
  13. ^ Mujtaba, Hassan (March 24, 2023). "AMD Radeon RX 7900 XTX GPU Overclocked To 3.4 GHz On Liquid-Cooling, Hits 650W Power Draw". Wccftech. Retrieved April 8, 2023.
  14. ^ Klotz, Aaron (January 29, 2023). "AMD GPU Appears to Leave Room for Future 3D V-Cache". Tom's Hardware. Retrieved April 8, 2023.
  15. ^ Ridley, Jacob (January 30, 2023). "Tiny spots on AMD's RDNA 3 GPU hint at massive cache potential". PC Gamer. Retrieved April 8, 2023.
  16. ^ Klotz, Aaron (December 12, 2022). "AMD's Radeon RX 7900 AV1 encoder is almost on par with Intel Arc and Nvidia's RTX 40 series". TechSpot. Retrieved April 8, 2023.
  17. ^ Taylor, Adam (December 14, 2022). "Tested: With RDNA 3, AMD Radeon is finally useful for content creators". PCWorld. Retrieved April 8, 2023.
  18. ^ Sag, Anshel (November 14, 2022). "AMD's New Radeon RX 7900XTX And 7900XT Put The Pressure On NVIDIA". Forbes.
  19. ^ "AMD Radeon RX 7600 Specs". TechPowerUp. Retrieved May 24, 2023.
  20. ^ "AMD Radeon RX 7600 XT Specs". TechPowerUp. Retrieved January 8, 2024.
  21. ^ Mujtaba, Hassan (January 8, 2024). "AMD Radeon RX 7600 XT 16 GB GPU Introduced: Faster 2048 Core RDNA 3 Chip, Double The VRAM of RTX 4060 At $329". Wccftech. Retrieved January 8, 2024.
  22. ^ "AMD Radeon RX 7700 XT Specs". TechPowerUp. Retrieved August 25, 2023.
  23. ^ "AMD Radeon RX 7800 XT Specs". TechPowerUp. Retrieved August 25, 2023.
  24. ^ Walton, Jarred (February 26, 2024). "AMD Radeon RX 7900 GRE review: the lowest binned Navi 31 variant is now globally available, starting at $549". Tom's Hardware. Retrieved March 1, 2024.
  25. ^ "AMD Radeon RX 7900 XT Specs". TechPowerUp. Retrieved November 4, 2022.
  26. ^ "AMD Radeon RX 7900 XTX Specs". TechPowerUp. Retrieved November 4, 2022.
  27. ^ "AMD Unveils World's Most Advanced Gaming Graphics Cards, Built on Groundbreaking AMD RDNA 3 Architecture with Chiplet Design". AMD (Press release). April 21, 2023.
  28. ^ "AMD Radeon RX 7600S Specs". TechPowerUp. Retrieved January 16, 2023.
  29. ^ "AMD Radeon RX 7600M Specs". TechPowerUp. Retrieved January 16, 2023.
  30. ^ "AMD Radeon RX 7600M XT Specs". TechPowerUp. Retrieved April 20, 2023.
  31. ^ "AMD Radeon RX 7700S Specs". TechPowerUp. Retrieved January 16, 2023.
  32. ^ Discuss, btarunr (2024-09-11). "AMD Intros Radeon RX 7800M Mobile Graphics Based on "Navi 32" Silicon". TechPowerUp. Retrieved 2024-11-12.
  33. ^ "AMD Radeon RX 7900M Specs". TechPowerUp. Retrieved November 15, 2023.
Retrieved from "https://en.wikipedia.org/w/index.php?title=RDNA_3&oldid=1148833039"