PowerColor Radeon RX 7900 GRE Hellhound Review

Name: PowerColor Radeon RX 7900 GRE Hellhound
Brand: PowerColor
Price: 580 USD

on Mar 22nd, 2024,

Manufacturer: PowerColor

Overclocking

Overclocking the Radeon RX 7900 GRE is very similar to the other RX 7900 Series cards.

To start, you have to raise the power limit to maximum, the slider ends at +15%
Next, max out the memory clock slider, it's rather short, topping out at 2316 MHz, definitely not high enough to use the full potential of the memory chips. The AMD Radeon 24.3.1 drivers increase this limit to 3000 MHz, which is enough to maximize the memory's potential, so you have to test for stability, in step of 20 MHz or so. In the table below I've added the performance results with this driver version as separate row.
Now, also increase "Max Frequency" to maximum, which is at 2803 MHz, not much higher than the default of 2530 MHz, another artificial limitation
At this point run a first stability test and record performance.
Now gradually lower the maximum voltage (default is 1.05 V), until your card becomes unstable, which happened for me at 0.89 V to 1.02 V, depending on the card.
Increasing the Min Frequency slider made no significant difference in performance. This might increase power consumption though for very little actual FPS improvement.

Maximum Overclock Comparison
	Avg. GPU Clock	Max. Memory Clock	Performance	Max Power Limit
ASRock RX 7900 GRE Steel Legend	2802 MHz	2316 MHz	72.9 FPS	300 W / 345 W / +15%
PowerColor RX 7900 GRE Hellhound	2803 MHz	2316 MHz	72.6 FPS	295 W / 340 W / +15%
PowerColor RX 7900 GRE Hellhound (24.3.1)	2803 MHz	2614 MHz	77.1 FPS	295 W / 340 W / +15%
Sapphire RX 7900 GRE Nitro+	2748 MHz	2316 MHz	74.8 FPS	305 W / 351 W / +15%
Sapphire RX 7900 GRE Pulse	2718 MHz	2316 MHz	74.7 FPS	270 W / 311 W / +15%
Sapphire RX 7900 GRE Pure	2734 MHz	2316 MHz	75.1 FPS	275 W / 320 W / +15%