GPU Buying Guide - (Read first post)
in Desktops ·
wiredotter14 said:I can't really speak to the specific performance for your exact workload, but I can certainly talk about power consumption.
I'm running a Radeon RX 580, while my brother uses a 6600XT.
Mine has a default TDP of 185W, and if you start overclocking, it goes even higher.
However, if you try undervolting to around 925-950mV and an underclock of 1150MHz, it pulls about 100W at full load during Ether mining, provided you leave the Video RAM at stock settings.
Of course, you could push that underclock or undervolt a bit further and settle comfortably around 120W.
If your software happens to be more sensitive to memory bandwidth than the actual GPU core, you shouldn't see much of a performance hit.
As for the 6600XT, it’s actually quite efficient, pulling about 150W at stock, and the Radeon RX 6600 pulls even less than that...
So, you should easily be able to tune both cards to pull a combined total of under 300W, and since each has a single 1x8-pin connector, it's manageable.
It shouldn't pose any issues for your power supply, though I am curious if your software pushes the Ryzen 7 3700X to its limit at the same time...
It does happen sometimes—if the system needs to decode an input format that the GPU doesn't support, the CPU has to step in, otherwise the GPU handles almost everything and the CPU stays relatively idle. But even then, we're talking under 100W at full load, and there isn't much point in overclocking besides using PBO.
There isn't much sense in overclocking the Radeon RX 580 because the gains are so marginal, and a heavier undervolt tends to make it unstable under heavy loads like Speed Warp, so I just stick to stock. The 6600XT is pretty hard to find right now anyway, and while the 6650XT pulls about 175W, the Radeon RX 6600 sits at around 130W...
And what about the heat situation, given that you have two cards stacked right on top of each other? My Radeon RX 580 is hitting just over 80C when it's fully loaded.
It's interesting, though; this Radeon RX 6600 stays quite cool on the bottom side, specifically regarding the PCB:
https://www.computerbase.de/2021-10/...review-test/3/