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crossfire & mobo question

post #1 of 4
Thread Starter 
so my 2 HD 4850 1gb crossfire not performing well cuz the 2 PCIe x16 in my mobo is operating at x16/x4. now the question:

1. why did my mobo promote crossfire with no equal PCIe slot? cuz some mobo can re-arrange to x8/x8 but mine can not.
2. what is the optimal PCIe lanes setup for both my gpu? PCIe 2.0 or 1.0 is enough?
3. can i overclock the crossfire setup?
4. can you recomend a good mobo for my crossfire setup?
5. can an unequal crossfire setup leads to BSOD?

can you guys help me?
Edited by jurigcipew - 2/27/11 at 9:22pm
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1st build
(14 items)
 
  
CPUMotherboardGraphicsRAM
X4 B55 3.7Ghz (1.36v) NB: 2600Mhz (1.27v) + CnQ BIOSTAR TA890FXE HIS Radeon HD 4850 CF Corsair 2x2Gb 1333 ddr3 @1600 1.5v 
Hard DriveOptical DriveCoolingOS
WD5000AADS 500Gb LG GH22 CM Vortex Plus Windows 7 Ultimate 64 bit 
MonitorPowerCase
LG LED 22" E2250 (1920x1080) Enlight Black Silver 750W VenomRX Taipan 
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Reply
post #2 of 4
this mobo is good will work at 8x each on the pcie 2.0
1. possibly you can config it in bios, or your mobo can support it?
2.you want the most band with possible so yea 2.0 @ 16x would be most optimal
3. yes you can
Bernice
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Bernice
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Light scribe Windows 7 Home Premium Asus VW246H, Dell 17" Hp stock 
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stock hp pavillion e9300z HP stock 
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by BadAssClocker View Post
this mobo is good will work at 8x each on the pcie 2.0
1. possibly you can config it in bios, or your mobo can support it?
2.you want the most band with possible so yea 2.0 @ 16x would be most optimal
3. yes you can
1. i can't find the setting in bios.

and the funny thing is in GPU-Z the PCIe lanes kept changing from PCIe 2.0 to 1.0 after boot. Not stable?

thanks for a fast reply.
1st build
(14 items)
 
  
CPUMotherboardGraphicsRAM
X4 B55 3.7Ghz (1.36v) NB: 2600Mhz (1.27v) + CnQ BIOSTAR TA890FXE HIS Radeon HD 4850 CF Corsair 2x2Gb 1333 ddr3 @1600 1.5v 
Hard DriveOptical DriveCoolingOS
WD5000AADS 500Gb LG GH22 CM Vortex Plus Windows 7 Ultimate 64 bit 
MonitorPowerCase
LG LED 22" E2250 (1920x1080) Enlight Black Silver 750W VenomRX Taipan 
  hide details  
Reply
1st build
(14 items)
 
  
CPUMotherboardGraphicsRAM
X4 B55 3.7Ghz (1.36v) NB: 2600Mhz (1.27v) + CnQ BIOSTAR TA890FXE HIS Radeon HD 4850 CF Corsair 2x2Gb 1333 ddr3 @1600 1.5v 
Hard DriveOptical DriveCoolingOS
WD5000AADS 500Gb LG GH22 CM Vortex Plus Windows 7 Ultimate 64 bit 
MonitorPowerCase
LG LED 22" E2250 (1920x1080) Enlight Black Silver 750W VenomRX Taipan 
  hide details  
Reply
post #4 of 4
hhmmm thats interesting i have seen mobos figure it out to equally split it however on newegg it shows that one pcie 2.0 is @16x and the other is @ 4X so your mobo might be designed that way mabey a bios update?
Bernice
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon II X4 635 Foxconn Aloe 1.01 Radeon HD 4350 Kingston ddr3 2gb X3 
Optical DriveOSMonitorKeyboard
Light scribe Windows 7 Home Premium Asus VW246H, Dell 17" Hp stock 
CaseMouse
stock hp pavillion e9300z HP stock 
  hide details  
Reply
Bernice
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Athlon II X4 635 Foxconn Aloe 1.01 Radeon HD 4350 Kingston ddr3 2gb X3 
Optical DriveOSMonitorKeyboard
Light scribe Windows 7 Home Premium Asus VW246H, Dell 17" Hp stock 
CaseMouse
stock hp pavillion e9300z HP stock 
  hide details  
Reply
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