AMD appears to have slightly reduced the specifications of upcoming, game-changing, MCM-based RDNA3 next-generation 7000 series Radeon GPUs
Navi 31 taped out almost 5 months ago and was recently spotted in developer changelogs indicating that it is on schedule for a launch later this year. It will be AMD’s first GPU that is built on the MCM philosophy (yes the same philosophy that made Zen such a trump card) and will be an undisputed game-changer for the GPU industry. Before we go any further, here is the list of SKUs that was leaked by Kepler (a source that has proven to be fairly reliable in the past:
N31 XTX 48WGP/96 CU/12288FP32N31 XT 42WGP/84CU/10752FP32N31 XL 36WGP/72CU/9216FP32 N32 XTX 32WGP/64CU/8192FP32N32 XT 28WGP/56CU/7168FP32N32 XL 24WGP/48CU/6144FP32 N33 XT 16WGP/32CU/4096FP32N33 XL 14WGP/28CU/3584FP32 https://t.co/EpvnevuCOu — Kepler (@Kepler_L2) May 2, 2022 More information on this was also posted by Greymon55 (via Videocardz):
— Redfire (@Redfire75369) May 2, 2022 As we can see, the top AMD Navi 31 MCM GPU has been reduced from 60 RDNA Workgroups to 48, with the CUs brought down from 120 to 96. What this essentially means is that the Radeon RX 7900 XT (or whatever AMD ends up calling it), has gotten its specifications slashed from 15360 to 12288 stream processors. There could be multiple reasons for this but the most likely one is yield. The more you reduce the final specifications of the product, the less dies you have to throw away (bin) for yield purposes. Similarly, the Navi 32 has been cut down from 40 Radeon Workgroups to 32, and CUs getting cut down from 80 to 64. This brings the stream processors down from 10240 to 8192. This GPU will be featured in the upcoming Radeon RX 7700 XT GPU (or whatever AMD decides to call it). Last but not least, AMD’s Navi 33 GPU - which is actually not an MCM GPU - has been cut down from 20 Radeon Workgroups to 16, and CUs have been reduced from 40 to 32. This brings the stream processors down to 4096 - which is AMD’s favorite number for mainstream GPUs for a while now. This will be featured in the Radeon RX 7600 XT GPU series (or whatever AMD decides to call it.) Here is a possible segmentation list (read: speculation) of the Navi 30 series dies by Kepler:
N31 XTX = 7970XTN31 XT = 7950XTN31 XL = 7900XTN32 XTX = 7800XTN32 XT = 7800N32 XL = 7700XTN33 XT = 7600XTN33 XL = 7600 — Kepler (@Kepler_L2) May 2, 2022 So here’s the thing. AMD’s RDNA3 series is going to be a gamechanger and probably the first to market with an MCM design. We have been told to expect performance figures of up to 92 TFLOPS. Assuming a 3GHz clock rate, however, the Navi 31 flagship will put out roughly 73 TFLOPs of single-precision compute. If we assume that the 92 TFLOPs figure is correct then the card must be clocked at close to 3.74 GHz - which is absolutely batshit crazy for a GPU.
— Greymon55 (@greymon55) May 2, 2022 Greymon55 did say that he expects the performance goals to remain the same and “may even be higher” so we won’t be reaching any conclusions till things get clearer. Meanwhile, NVIDIA’s upcoming ADA Lovelace GPU is rumored to be gearing up to put out a massive 100 TFLOPs of power so there is definitely a GPU war brewing.
