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AMD Radeon RX 7800 XT Review

W1zzard

on Sep 6th, 2023,

in Graphics Cards.

Manufacturer: AMD

Value & Conclusion »

Overclocking

GPU-Z Screenshot for Overclocked Graphics Card

Overclocking is pretty complicated, just like on other RDNA 3 cards. Just adjusting the clock frequencies will have no significant performance impact.

First of all, you should raise the power limit to the maximum of +15%, to make sure that's out of the way.
Next, set the maximum clock range to the maximum of 5000, so that doesn't limit us either.
Now set the minimum clock to 2800 (don't set it too high or the card will crash). If later on you notice that clocks during testing seem stuck around that mark, you can raise it further to 3000 and 3200. This really doesn't set actual minimum clock, but rather acts as some sort of guidance for AMD's clocking algorithm.
From here on slowly reduce maximum voltage until your card becomes unstable running benchmarks or games. Undervolting is a must for RDNA 3, because that will free up some power headroom for the clock algorithm to push frequencies higher. These cards typically get unstable around 950 mV, so there's a lot of headroom (the default is 1.15 V).
Once that is finished, bump up the voltage by 50 mV (to ensure there's no GPU clock instability). Now set memory to 2600 MHz and work your way up in steps of 10 or 20 MHz. When running stability testing the memory will just crash at some point, there's no artifacts or slowdowns.
With maximum memory figured out, restore your undervolt and start playing games
If you notice any instability, increase voltage by 10 mV, or lower memory OC a little bit. No need to touch the clock sliders.

Maximum Overclock Comparison
	Avg. GPU Clock	Max. Memory Clock	Performance	Min Voltage
AMD RX 7800 XT	2721 MHz	2630 MHz	66.4 FPS	970 mV
ASRock RX 7800 XT Phantom	2878 MHz	2640 MHz	68.7 FPS	930 mV
ASUS RX 7800 XT TUF	2846 MHz	2650 MHz	68.1 FPS	910 mV
PowerColor RX 7800 XT Hellhound	2831 MHz	2610 MHz	67.9 FPS	920 mV
Sapphire RX 7800 XT Nitro+	2936 MHz	2640 MHz	69.5 FPS	850 mV
XFX RX 7800 XT Merc 319	2727 MHz	2640 MHz	67.8 FPS	940 mV
ASUS RX 7700 XT TUF	3133 MHz	2530 MHz	59.5 FPS	770 mV
Sapphire RX 7700 XT Pulse	3025 MHz	2520 MHz	58.2 FPS	810 mV
XFX RX 7700 XT Qick319	3133 MHz	2540 MHz	59.2 FPS	750 mV