Hey guys, I'm really stuck and frustrated with my Crossfire problems. I am coming from GTX 680 SLI and no other hardware has changed. I did a full driver clean and reinstall using DDU.
Please read through what I've experienced and offer suggestions.
Specs(main bits):
i7 2600k @4.8ghz
p8p67 Pro
MSI Gaming R9 290 / Sapphire Tri-X R9 290 (both on Legacy bios I believe)
Silverstone Strider ST85 (850 watt)
2x 256gb SSD, 2x 2TB HDD
Corsair XMS 8GB 1600 DDR3
Windows 7 SP1
Using HDMI or DVI-D
Temperatures obviously vary, but they are not wildly high in Crossfire. On average it's top card 65-70, bottom card 60-70.
When not running crossfire, they perform fine and I get no crashes regardless of driver version, voltages or memory clocks.
Together they crash/black screen often in games. When they do crash games, it is after it's loaded a map or assets.
Game examples, all in 2560x1600:
-BF4 let's me work through a map for about a a minute and then gives me a Direct X texture render/allocation error and occasionally the VRAM error(like when you try to run 200% resolution on a low VRAM GPU). It then proceeds to crash Windows Explorer when I try to open task manager and says system RAM allocation is out of memory. However if I reduce the settings from Ultra to High, it doesn't crash.
-Skyrim loads up fine and then when I pan the camera it slows to a crawl and all textures go black.
-Bioshock Infinite black screen/not responding after about a minute in.
-Firefall won't launch.
-Far Cry 3 purrs along nicely for ten minutes and then crashes to desktop.
I've tried :
-Different combinations of the BIOS switch on each card
-Both cards physically alone in both PCI E slots, and also with them installed simultaneously but Crossfire disabled via software.
-Undervolt/overvolt, underclock/overclock shared or separate profiles(includes lowering memory to 1000)
-Disabled ULPS
-Enabled/disabled 'Extend Official Overclock Limits' in Afterburner
-Synced and unsynced GPU settings in Afterburner
-Several complete driver reinstalls, fresh from 13.12 to 14.7
-Checked all the fans, cooling solutions and monitored no excessive or new high temperatures
-Installed CCC to ensure Catalyst AI was on standard instead of advanced setting
-Disabled any overlays AB, RP etc.
-Run on single monitor
On the plus side, they have yet to BSOD, RSOD or turn off the computer/power down.
Possibilities :
A)I thought maybe it was PSU related, but wouldn't I be facing constant and instantaneous crashing rather than a delayed fail? Also would I not see more BSODs and complete computer shut-offs if it was PSU? If it can pass a Heaven run....
B)I read somewhere that 290s had a problem with supplying enough voltage when used in PCI E 2.0 configurations. It just so happens my board runs both these cards at 2.0 x8. And while this may have some relation, I've seen several persons with similar motherboards PCI-E setups whom do not have the problem.
C)Something wrong with the texture fill or VRAM, given that BF4 crashes on ULTRA and Skyrim gets black textures which is a known issue when you run out of memory.