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7850 on the PCIE 2.0 4x slot is half the speed of it on the 16x (Crossfire issue)

post #1 of 6
Thread Starter 
I've got my 7850 running in Crossfire but I couldn't get it to run at the speed that people are saying it would, 5% off in 16x/4x slots. It utilises 98% of the gpu, but I'm getting 50% off the framerates when I benchmark one card on the 4x compared to it running on 16x in Unigine 4.0 Ultra/Extreme tests.

BF3 and Unigine Heaven 4.0 stutters like mad.

Specs:

Asrock Z77 Pro 3
i5 3570k @ 4.5GHz
8 GB DDR3 RAM
2 x Sapphire 7850 1GB
Edited by isyiigood - 9/9/13 at 9:49am
post #2 of 6
You bought the wrong board if you wanted to run SLi or Crossfire.
wevs rig
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wevs rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
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Razer DeathAdder SteelSeries Creative Soundblaster X-FI Titanium HD 
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post #3 of 6
Thread Starter 
Didn't plan to Crossfire when I bought it so it's actually an upgrade, I guess I'd have to at least get a 8x/8x but does it really cripple that bad on 4x?
post #4 of 6
Yes, it can cripple it that bad. You're best bet is to sell or return the board and buy one that is designed and intended to be used with dual GPU solutions in mind.
wevs rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
MouseMouse PadAudio
Razer DeathAdder SteelSeries Creative Soundblaster X-FI Titanium HD 
  hide details  
Reply
wevs rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
MouseMouse PadAudio
Razer DeathAdder SteelSeries Creative Soundblaster X-FI Titanium HD 
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post #5 of 6
Thread Starter 
Alright, thanks man. Have my eyes on the Z77 Extreme4 thumb.gif
post #6 of 6
You're welcome. And much better choice on the board for multi-gpu setups smile.gif
wevs rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
MouseMouse PadAudio
Razer DeathAdder SteelSeries Creative Soundblaster X-FI Titanium HD 
  hide details  
Reply
wevs rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
MouseMouse PadAudio
Razer DeathAdder SteelSeries Creative Soundblaster X-FI Titanium HD 
  hide details  
Reply
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Overclock.net › Forums › Graphics Cards › AMD/ATI › 7850 on the PCIE 2.0 4x slot is half the speed of it on the 16x (Crossfire issue)