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ching issues, not enough power for CF?

post #1 of 7
Thread Starter 
EDIT: rofl copy and paste title fail, sorry, suppose to say Hitching issues

Hey guys I recently upgraded my videocard to 2 Sapphire 6970 from one XFX 4890. The 4890 when I was using it, worked perfectly, no hitching no stuttering. However with these new cards I am experiencing massive hitching across the whole computer, my keyboard would spam whatever key it was typing at the time (ex. appllllllllllllllllllllllllllllllllle) and mouse would freeze for a second. With one videocard it seems to work okay but still has the issues but less frequently.

This is my specs
P6T Motherboard
I7920 @ Default
Cooler master 850W Modular Power Supply
Crossfire Sapphire 6970
Kingston 128GB SSD
500GB Caviar Black HD
Running three LED 27inch Monitors for Eyefinity

Right now, I believe it's the PSU that's the culprit, I've tried 2 6850s too, and they also stutter/hitch not only the game BUT THE KEYBOARD AND MOUSE too. I am really stumped, It's not the SSD because I have tried installing the drivers onto a normal HD drive and with the 4890, it is fine.

Do you guys also think it's the PSU causing my problems? What else do you think it is?
Edited by Metsuna - 6/2/11 at 10:36pm
post #2 of 7
Have you tried re-install the Ati driver when you switch to 2x 6970?
~|Nanpa|~
(15 items)
 
  
CPUMotherboardGraphicsRAM
|A8-3870k 3.5Ghz| |Gigabyte GA-A75-UD4H| |Onboard 6550D -_-| |Samsung 30nm Low Profile 2133 Cas9| 
Hard DriveOptical DriveCoolingOS
|Corsair Force GT 90GB|WD 820GB| |SamSung BluRay| |Stock Heatsink -_-| |Win 7 Ultimate x64| 
MonitorKeyboardPowerCase
|Samsung S27A950 120Hz 3D| |Microsoft SideWinder X4| |CorSaiR HX650| |Open TechBench|White LeDs|PurPle UV| 
MouseMouse PadAudio
|Microsoft SideWinder X8| |SteelSeries Diablo III| |OnBoard| 
  hide details  
Reply
~|Nanpa|~
(15 items)
 
  
CPUMotherboardGraphicsRAM
|A8-3870k 3.5Ghz| |Gigabyte GA-A75-UD4H| |Onboard 6550D -_-| |Samsung 30nm Low Profile 2133 Cas9| 
Hard DriveOptical DriveCoolingOS
|Corsair Force GT 90GB|WD 820GB| |SamSung BluRay| |Stock Heatsink -_-| |Win 7 Ultimate x64| 
MonitorKeyboardPowerCase
|Samsung S27A950 120Hz 3D| |Microsoft SideWinder X4| |CorSaiR HX650| |Open TechBench|White LeDs|PurPle UV| 
MouseMouse PadAudio
|Microsoft SideWinder X8| |SteelSeries Diablo III| |OnBoard| 
  hide details  
Reply
post #3 of 7
Thread Starter 
I've reinstalled countless times, tried different drivers, older drivers, the drivers they gave you on CD, all with the same issue.

I am sorta afraid it might be the motherboard, but my 4890 was working fine before I upgraded so I am not sure.
post #4 of 7
What is the exact model of the PSU? I ran literately 3 6970 on the Corsair AX750 before so unless your PSU is a completely garbage, it should be able to run 2x 6970 without any problems.
~|Nanpa|~
(15 items)
 
  
CPUMotherboardGraphicsRAM
|A8-3870k 3.5Ghz| |Gigabyte GA-A75-UD4H| |Onboard 6550D -_-| |Samsung 30nm Low Profile 2133 Cas9| 
Hard DriveOptical DriveCoolingOS
|Corsair Force GT 90GB|WD 820GB| |SamSung BluRay| |Stock Heatsink -_-| |Win 7 Ultimate x64| 
MonitorKeyboardPowerCase
|Samsung S27A950 120Hz 3D| |Microsoft SideWinder X4| |CorSaiR HX650| |Open TechBench|White LeDs|PurPle UV| 
MouseMouse PadAudio
|Microsoft SideWinder X8| |SteelSeries Diablo III| |OnBoard| 
  hide details  
Reply
~|Nanpa|~
(15 items)
 
  
CPUMotherboardGraphicsRAM
|A8-3870k 3.5Ghz| |Gigabyte GA-A75-UD4H| |Onboard 6550D -_-| |Samsung 30nm Low Profile 2133 Cas9| 
Hard DriveOptical DriveCoolingOS
|Corsair Force GT 90GB|WD 820GB| |SamSung BluRay| |Stock Heatsink -_-| |Win 7 Ultimate x64| 
MonitorKeyboardPowerCase
|Samsung S27A950 120Hz 3D| |Microsoft SideWinder X4| |CorSaiR HX650| |Open TechBench|White LeDs|PurPle UV| 
MouseMouse PadAudio
|Microsoft SideWinder X8| |SteelSeries Diablo III| |OnBoard| 
  hide details  
Reply
post #5 of 7
Wipe them instead of deleting them.
post #6 of 7
Thread Starter 
It's the Coolermaster RS-850-AMBA-J3 Modular Power supply.

If it is not the PSU, I don't have any idea what would cause such weird behavior. It happens more often when I game than anything. Can't even type properly half the time.
post #7 of 7
Thread Starter 
Replaced the PSU with a 1000W Coolermaster Silent Pro. Hitching problems went away. Thanks for the help guys.
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