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RX 7900XT, 15,360 cores, MCM, Tapeout Q4

loftie said:
I believe the USA has a max power draw per plug of 1.x. generally. I can't remember what it is exactly. I think their electric heaters are also limited to around 1.5kw.
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I just googled it and houses in the US run 120v with 15amp or 20amp circuits. That means their plugs can handle between 1800w and 2400w
 
New AMD Radeon PRO W6000X Series GPUs Bring Groundbreaking High-Performance AMD RDNA 2 Architecture to Mac Pro

https://videocardz.com/press-releas...x-duo-with-two-navi-21-gpus-for-apple-mac-pro


bCvC4aV.jpg

AMD Radeon Pro W6800X Duo


They should have just done the W6900X Duo that way it would have had 160 compute units. Anyways 400w card in that form and clearly power limited to be 400w when the single version is 300w. up to 30 TFLOPS.. meeh
 
Purgatory said:
New AMD Radeon PRO W6000X Series GPUs Bring Groundbreaking High-Performance AMD RDNA 2 Architecture to Mac Pro

https://videocardz.com/press-releas...x-duo-with-two-navi-21-gpus-for-apple-mac-pro


bCvC4aV.jpg

AMD Radeon Pro W6800X Duo


They should have just done the W6900X Duo that way it would have had 160 compute units. Anyways 400w card in that form and clearly power limited to be 400w when the single version is 300w. up to 30 TFLOPS.. meeh
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Isnt the idea of this mcm stuff that it will be the same as a cpu with x cores all occupying the same space rather than 2 separate parts of the pcb?
 
timorous said:
128 bit bus + clocks on a better point in freq/volt curve + 8GB ram should mean N33 is less power hungry than N21. I really doubt it will pull 300W.
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If looked at the news more recently you'd know that there is zero chance AMD will ever make a 128bit desktop GPU ever again because if they do they won't be able to sell it to a large part of the US market
 
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Grim5 said:
If looked at the news more recently you'd know that there is zero chance AMD will ever make a 128bit desktop GPU ever again because if they do they won't be able to sell it to a large part of the US market
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This is nonsense. The regulations give OEMs an idle KWh/yr power target for a given amount of expandability. https://energycodeace.com/site/custom/public/reference-ace-t20/index.html#!Documents/section1604testmethodsforspecificappliances.htm is a link to the table that determines the ES.

On top of that baseline idle KWh/yr allowance are adders for dGPUs, additional storage etc etc. The adder for dGPUs is a calculation based on the Frame Buffer bandwidth. I would consider Infinity Cache to be part of the frame buffer so you should incorporate its bandwidth somehow. You can do it as a % of total frame buffer or you could do it on the average hit rate at a given resolution.

The calculation (available at the link in section 1605.3 v table V-8) is 29.4*tanh(0.008*bandwidth in GB/s-0.003)+11+(0.011*bandwidth in GB/s)

If you actually plug in some numbers then 128GB/s gets you 35 KWh/yr on the adder and 2048GB/s gets you 63 KWh/yr on the adder. Dropping below 128 and the adder drops off faster and going above 2048 sees it increase faster but between those values you get a steady increase in additional idle power budget.

For a likely 256GB/s N33 you get 42 KWh/yr and for the probably 512GB/s of N31 you get 46 KWh/yr. For reference the 3080 gets just 49 KWh/yr on the adder and Radeon 7 gets 52 KWh/yr.

To swing this back around to RDNA3, with the above numbers N33 being a 128 bit bus, N32 being 192 bit and N31 being 256 bit is not at all going to be a problem and if IC bandwidth is factored in as well it is even less of a problem.
 
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