so I have two sapphire 390x's one clocked at 1050, one at 1080.
I'm trying to overclock them but I can't seem to get them stable no mater what I do. even when I oc the 1050 to 1080 and set the core voltage and power limit to the max my computer freezes.
I have a 1000w EVGA g2.
am I missing something here? I have ultra low power mode disabled and everything else recommended online.
Try running both at 1050MHz.
Try disabling CF first and over-clock them separately to test each cards limits? You may need to run your display through each card separately to test for artefact's and issues also.
I don't think the 290-390x cards are very overclockable, its not like NVIDIA cards that can achieve %20-30 overclocks.
well I'm just peeved I can't even get the 1050mhz up to 1080mhz....
I'll do some more individual tests later.
I've seem on forums people getting them upto 1200~ on the core and 1650 on the memory.
My last 390x (I have a new RMA one now) couldn't even maintain its stock clocks, even after reseating the thermals. So if there getting those overclocks then kudos to them, but with what cooling I wonder?
ok update, I think it was my CPU overclock causing the problems, which is weird since its been stable so far. gonna re oc them and try again
I've never crossfired before, but from what I read little of the process it's usually overclocking the cards individually to their silicon's best ability and the when in crossfire the card with the highest clocks will down clock to the same as the lowest clocks. FYI, you cpu may not have been stress test to the fullest for stability inspection. You should add apps like Aida64 and Realbench to fully stress test various tasks and instruction sets the cpu is capable of.
The 290-390 series cards are well known for not really overclocking..
I did. I found my 4690k stable at 4.7ghz @1.4v seems 3dmark disagrees in the combines test.
@The_Space_Bear
Just to be sure is "Synchronize settings for similar graphics processors" unchecked? And when you tried OC'ing individually are they connected to the PCI-E power cord one at a time only as oppose to both? R9 290x/390x are usually overclockable at about 1100Ghz-1150Ghz Core generally, and silicon lottery at about 1200Ghz core. Memory on the other hand can easily get to 1600Ghz even on Elpidia, as long you find your golden ratio because Memory Voltage is tied to Core Voltage (Not Aux Voltage) for these series of cards.
I have disabled ULPS, left unofficial OC mdoe alone, and enabled unified GPU usage monitoring.
I seem to have them "stable" but anything above 1115mhz causes artifacting it seems.
turns out this was a CPU issue.
I JUST WANT MY 3D MARK HIGH SCORE
What temps are you getting with two of those out of interest?
since monitoring on AMD is kinda fucked. I don't know about the bottom card, but I know the top card (the 1080mhz one) hits 80c second it goes under load but it stay around there, likely from heat on the bottom card rising.
cooling?
I recommend going with pci-e risers, and seperate those cards out.
If you are going on air, and have shitty cooling or no space in between them - it doesn't matter which you have nv or amd... both will be affected like that.
for my overclocking setup in past with 2-4x 290x's i had 6k rpm fan blowing the air in between them. It was loud also.
Either move to watercooling - which i considered there's no point, or get aio cooled card. - aio cooled cards are much better. They are quiet, and cool. (there's more room required for 120mm radiator but its much better anyway.)
(and yes i had 4x 290x at one time... noise was killing me after i moved in to studio apt. so i sold 2 others and then sold the other 2 and bought fury-x - and i'm happy with it.
all on air, but the cards have plenty of space in between them and my case has good airflow.
also fuck AIO, I had a Fury X and sold it because the pump was annoying as hell at idle.
4x 290x?! xD
Temp is the one I'm concerned about. If it's not too much to ask can we have a picture of your case without the panel? I want to see your air configuration.
at work atm, but its basically an R5, with a Z97-A
so the GPUs have about an inch or so between them, with half an inch between top gpu and CPU cooler and bottom GPU and PSU.
80c is the highest I've seen the GPUs go under stress (and the bottom one is cool to the touch usually so I'm guessing its just the top one)
With Crossfire/Sli setup on air 1 card will usually run cooler than the rest. I would still need an info on your case fans and what type of air flow you got going on in there.
I have a 120mm exhaust fan and two 140mm fans in the front, with a NH-D14 on the CPU.
I'll have to update this later tonight
