Question Speculation: RDNA3 + CDNA2 Architectures Thread

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uzzi38

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Oct 16, 2019
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Kaluan

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Jan 4, 2022
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RDNA3 and Ada, Ampere are pretty similar in that they doubled FP32 units, while only half is capable of executing also INT32.
Yet, Ampere saw a lot bigger IPC(PPC) gain than RDNA3. Why? Is this truly only driver fault or Nvidia is using more HW.

Strangely enough, from my findings, compute uplift and meta launch day gaming performance uplift (3Dcenter) shows almost identical gains for both Turing to Ampere and RDNA2 to RDNA3:

3090 to 2080Ti and 7900XTX to 6900XT:
~2,65x compute and ~47% raster 4K both, ~58% and ~61% 4K RT 3090 and 7900XTX.

Bare in mind both are competing with their previous gen w/ pristine drivers. Versus launch day 2080Ti and 6900XT performance would be different, but that's beyond the scope of my comment.

The main difference is RDNA3 arguably saw a bigger node jump from RDNA2 than than Ampere saw from Turing. And AMD clearly planned for bigger gains. Hopefully it's not all down to hardware mishaps and they can improve the situations by drivers.

I compared boost full N23 vs boost full N33, because I thought he was talking about boost clock.

We still don't know If he was talking about boost or game clock, so you can't confidently say he was talking about game clock. With this in mind, you can't really say I was comparing apples to oranges.
We don't even know If It's 2700MHz, he said comparable to RX 6650XT AIB and I just guessed this frequency.

I will compare full N23 vs full N33:
Boost clock: 2416MHz vs 2700MHz (+12%)
Game clock: 2162MHz vs 2700MHz (+25%)
If I consider that he said desktop RX 6750XT level of performance on average, then this clock really should be game clock, It would be just a bit higher(+8%) than 2495MHz for RX 6750XT.
The rest has to come from the architecture ad that would be ~20%.
That's a lot.
Yeah that's what it came down to for me, what clocks are we comparing.

I wonder if desktop N33 is the same silicon as these soon the be announced laptop chips or newer. And how much further could a 150-180W TGP SKU clock from the specs we'll see at CES.
 

Stuka87

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Dec 10, 2010
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Slightly off the current topic, but has anybody else been keeping track of stock for the 7900 XT and XTX?

The XT is coming back in stock pretty much every day. NowInStock shows new cards arriving all the time. However, the XTX is almost never coming in stock.

This suggest that the vast majority of cards being built are XTs. This is contrary to how most people though the 7900 XT only existed to upsell people to the XTX. But maybe the XT is priced so close because AMD knew that XTX cards were going to be manufactured in much lower quantities, so price the XT a bit higher to make up some of the difference?
 
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nurturedhate

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Aug 27, 2011
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Slightly off the current topic, but has anybody else been keeping track of stock for the 7900 XT and XTX?

The XT is coming back in stock pretty much every day. NowInStock shows new cards arriving all the time. However, the XTX is almost never coming in stock.

This suggest that the vast majority of cards being built are XTs. This is contrary to how most people though the 7900 XT only existed to upsell people to the XTX. But maybe the XT is priced so close because AMD knew that XTX cards were going to be manufactured in much lower quantities, so price the XT a bit higher to make up some of the difference?
Been on the hunt for a Sapphire Nitro XTX. Nowinstock hasn't been close to accurate for drops. There are more XT's available than XTX's but I know of no one that wants an XT. Ref XTXs and Merc310s pop in and out of stock all day, every day. I still have mercs sitting in my cart at bestbuy. Amazon has red devils today as well.

There's just not a lot of reason to buy an XT if you already have a 6800xt or better and if you're on something older there's no point in buying the XT over the XTX.
 

Stuka87

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Dec 10, 2010
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Been on the hunt for a Sapphire Nitro XTX. Nowinstock hasn't been close to accurate for drops. There are more XT's available than XTX's but I know of no one that wants an XT. Ref XTXs and Merc310s pop in and out of stock all day, every day. I still have mercs sitting in my cart at bestbuy. Amazon has red devils today as well.

There's just not a lot of reason to buy an XT if you already have a 6800xt or better and if you're on something older there's no point in buying the XT over the XTX.

My reasoning for edging towards the XT over the XTX is power consumption. A card with 3x8pin requires me to get a new PSU. Which makes the $100 prices increase of the XTX to actually be more like $200.

And I have been looking manually as well. The XTs do sell out, and then get new stock the next day. And while NiS has not been totally accurate for the XTX, manual searches show its also not getting replenished nearly as often.
 

nurturedhate

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Aug 27, 2011
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My reasoning for edging towards the XT over the XTX is power consumption. A card with 3x8pin requires me to get a new PSU. Which makes the $100 prices increase of the XTX to actually be more like $200.

And I have been looking manually as well. The XTs do sell out, and then get new stock the next day. And while NiS has not been totally accurate for the XTX, manual searches show its also not getting replenished nearly as often.
Needing the Sapphire specifically due to case limitations, it's the shortest at 320mm. Going to need to replace my carbide 540 next build it seems.
 

Stuka87

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Dec 10, 2010
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Needing the Sapphire specifically due to case limitations, it's the shortest at 320mm. Going to need to replace my carbide 540 next build it seems.

I did not go with that case for a prior build specifically because of the maximum GPU length limits. Its a nice case otherwise. But really like my current O11.
 

Tup3x

Golden Member
Dec 31, 2016
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Slightly off the current topic, but has anybody else been keeping track of stock for the 7900 XT and XTX?

The XT is coming back in stock pretty much every day. NowInStock shows new cards arriving all the time. However, the XTX is almost never coming in stock.

This suggest that the vast majority of cards being built are XTs. This is contrary to how most people though the 7900 XT only existed to upsell people to the XTX. But maybe the XT is priced so close because AMD knew that XTX cards were going to be manufactured in much lower quantities, so price the XT a bit higher to make up some of the difference?
Here in Finland there has been barely any XTX cards available (not many has been sold because the stock has been really low). Reference XT never sold out and people aren't buying.
 

GodisanAtheist

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Nov 16, 2006
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Ah AMD, how did they go from a very solid RDNA2 gen to a total dumpster fire of an RDNA3 generation...

I mean if they literally did nothing with the cooler... It would have been fine?
 

adamge

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Aug 15, 2022
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7900xt has been in stock constantly since launch on amd.com for Canada, while 7900xtx has been out of stock the entire time. This is from my own manual checking, so obviously there are gaps in my sampling, but I check about 5 times a week.
 
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nurturedhate

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Aug 27, 2011
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7900xt has been in stock constantly since launch on amd.com for Canada, while 7900xtx has been out of stock the entire time. This is from my own manual checking, so obviously there are gaps in my sampling, but I check about 5 times a week.
10am est most weekdays are when they have xtx's for sale on amd.com
 

Trovaricon

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Feb 28, 2015
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I find it interesting that it is supported only in the "new" wave32, nice simple write conflict avoidance (dest vgpr restriction),
Does someone know how this differs from NVidia's Ampere dual-issue fp32+int32 implementation?
 
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jpiniero

Lifer
Oct 1, 2010
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Looks like at least Navi 33 laptop will be announced. This particular model has 120 W TGP.
 

gdansk

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Feb 8, 2011
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N33 looks unimpressive in their own slides. But the die is about 0.85x on similar process. It may be the most successful RDNA3 in that metric. Would be neat if they passed the savings down to consumers in the desktop 7600XT. But it'll have a $400 MSRP despite being worse in many respects than a 6700 XT 12GB you can get for $370.
 
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TESKATLIPOKA

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May 1, 2020
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RX 7700S when It's weaker than 7600M XT and 4 different models?
You really need only the two RX 7600M(XT) models, 28CU + 16gbps(50-90W) and 32 CU +18gbps(75-120W). The S models are totally pointless. Congratulations, AMD marketing department, you are utter mor*ns.
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