Discussion RDNA4 + CDNA3 Architectures Thread

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DisEnchantment

Golden Member
Mar 3, 2017
1,770
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With the GFX940 patches in full swing since first week of March, it is looking like MI300 is not far in the distant future!
Usually AMD takes around 3Qs to get the support in LLVM and amdgpu. Lately, since RDNA2 the window they push to add support for new devices is much reduced to prevent leaks.
But looking at the flurry of code in LLVM, it is a lot of commits. Maybe because US Govt is starting to prepare the SW environment for El Capitan (Maybe to avoid slow bring up situation like Frontier for example)

See here for the GFX940 specific commits
Or Phoronix

There is a lot more if you know whom to follow in LLVM review chains (before getting merged to github), but I am not going to link AMD employees.

I am starting to think MI300 will launch around the same time like Hopper probably only a couple of months later!
Although I believe Hopper had problems not having a host CPU capable of doing PCIe 5 in the very near future therefore it might have gotten pushed back a bit until SPR and Genoa arrives later in 2022.
If PVC slips again I believe MI300 could launch before it

This is nuts, MI100/200/300 cadence is impressive.



Previous thread on CDNA2 and RDNA3 here

 
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Mopetar

Diamond Member
Jan 31, 2011
8,282
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I'm not really sure how FP4 is any better than INT4. You don't get any additional representations and a 4 bit floating point number seems pretty useless. Even without a sign bit you're still extremely limited in either range or precision. At a certain point you could just use INT4 and treat it like an exponent field.

If anyone has any knowledge or expertise on this I'm genuinely curious.
 

ToTTenTranz

Senior member
Feb 4, 2021
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I'm not really sure how FP4 is any better than INT4. You don't get any additional representations and a 4 bit floating point number seems pretty useless. Even without a sign bit you're still extremely limited in either range or precision. At a certain point you could just use INT4 and treat it like an exponent field.

If anyone has any knowledge or expertise on this I'm genuinely curious.
Yes, that was my point.

I don't get how useful the floating point is in a 4 bit variable. The architecture supports INT4 already.
 

Saylick

Diamond Member
Sep 10, 2012
3,858
8,927
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Random guy on Reddit claims to have some benchmark results via contact at a retailer. Take with a big grain of salt:
Can't disclose my sources, but here you go...
Cyberpunk 2077 (custom scene, 4K, no RT)
9070XT = 63FPS avg, 9070 = 52FPS avg (5070Ti scored 60FPS, 5080 scored 69FPS)
Alan Wake 2 (4K, no RT, custom scene)
9070XT = 59FPS, 9070 = 48FPS (5070Ti scored 55 FPS, 5080 scored 63FPS)
And now for RT... Cyberpunk 2077 RT Ultra in 4K (custom scene)
9070XT gets 28FPS (no upscaling!) and 9070 gets 21FPS (5080 scored 33 FPS, 5070TI scored 29FPS)
PATH TRACING in 4K the 9070XT got 10FPS and the 9070 got 8 FPS (5080 scored 15FPS and 5070Ti got 12FPS)
Here you go, some numbers from a review sample OCing takes it to 5080 levels, but you can also overclock the 5080, that's true
Overall, with final data I gathered... 9070XT is a replacement to the XTX in raster, much better RT, losing some VRAM, but it didn't matter in testing for now... You get FSR4 and RT is just leagues ahead, it's a tier ahead of the XTX
Regarding price:
549\649 give or take a few dollars, from what I could gather. Street price a little higher. I don't have official info on that, just a retailer that disclosed some prices, and since they have VAT, AIB premium etc I can only do an estimation

 

reaperrr3

Member
May 31, 2024
76
243
66
As rightly noted here, fake NV's msrp may soon be gone or get close to the real one.
Same for AMD.
A 100$ lower MSRP likely means AMD is selling the GPU+mem for at least ~100$ less than what NV asks for the 5070Ti GPU+mem.

If the XT is faster than the Ti in raster and not much slower in RT, an MSRP below 649$ is objectively fairly pointless.
Either AIBs, shops or scalpers would drive up the price to at least ~90-95% of the 5070Ti's current actual prices anyway.
 
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