Fully unlocked RX 7900 XTX very nearly matches RTX 4090 performance
In the weeks and months before the launch of AMD's Radeon RX 7900 XTX(opens in new tab), enthusiasts were hoping AMD's graphics cards could go toe to toe with the best Nvidia had to offer. In the end, the RTX 4090(opens in new tab) took this generation's gaming crown. However, it's clear AMD made a conscious decision to limit the power consumption of the XTX, leaving us wondering just what AMD's Navi 31 chiplet GPU was ultimately capable of.
That question has been answered, thanks to a post by user jedi95(opens in new tab) in the AMD subreddit(opens in new tab). Jedi95 took an Asus TUF Radeon RX 7900 XTX(opens in new tab) and modded it to eliminate the card's power limit. The mod involved connecting an Elmor Labs EVC2SE to the I2C bus on the GPU's PCB.
After the mod, with no more pesky power limits to worry about, the card was able to achieve a peak GPU clock of 3,467MHz, or more importantly, an average of 3,333MHz. Not bad, not bad at all. That meant the card was able to deliver a graphics score of 19,137(opens in new tab) in 3DMark's Time Spy Extreme test. For reference, my RTX 4090 Founders Edition scores 19,540 in the same test, meaning the unlocked RX 7900 XTX is very nearly a match for Nvidia's best.
Of course, the RTX 4090 can be overclocked too. What jedi95's results really show is that AMD could have increased the TDP of the card from its base 355W if it really wanted to.
That's the good news part. The problem with unlocking power limits is, umm, power! The card reportedly pulled a stratospheric peak of nearly 700W (696W to be precise). Given the high peak temperatures inherent to some AMD's RX 7900 cards (the reference cards anyway(opens in new tab)), it's no surprise to learn that the tested card required
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