Where do these numbers come from?
Google can't seem to find this graph.
EDIT:
Found
this thread on a German forum, where the image comes from. The first post has a link to
a set of data, but still no word on how power limiting on the 7900XTX was achieved.
That's my
You can find the original post to the data easily, just search for "RX 7900 power scaling".
?
You can't even reduce the power limit by -50% on RDNA3.
This's probably correct, because it power-scales very badly and AMD has limited it because of this.
Looks like the most is 17% with custom software.
275W/355W -> 22.53%. 22.5% would be just ok, if it power-scaled nicely at this percentage.
Maybe last graph contains results from OP tests. I found only
this about performance scaling but there isn't results below 275 watts.
Correct. Fortunately and unfortunately, the 275W result shows already enough, especially when I put it all together in a good comparison graph.
I am not sure if that is legit or not but the 675w 7900XTX being slower than the 300w 4090 numbers makes me lol pretty hard if true can't be that bad can it...... Kinda wish they would have made a video.
I've only tested this on a 4070/4090 and both have excellent power scaling the 4070 can get to about 150w without losing any performance and the 4090 about 350w but I imagine that will vary card to card.
It's probably legit. The only good thing is that with more power the RX 7900 XTX improves its score more than the 4090, but ofc the power consumption gets ridiculous and the efficiency is well beyond the sweet spot.
Can confirm, the graph of my 4070:
-25% power consumption results in only -5% performance.
It may vary only slightly tho.
I hope AMD improves their chiplet design in next gen. Moving data around consumes by far the most power. Maybe that's the reason for the power scaling issues.
