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Moved Graphics Card to different x16 slot, performance drop.

post #1 of 10
Thread Starter 
Hi I recently upgraded from my old 5770 to a 6870(I know last gen but it was on sale for 110.00) and at the same time grabed a wireless card since I'm bumming off my landlord's (who lives next door, thats a whole other topic I need help on) WI-FI. The problem with that is if my graphics card is in the top x16 slot it covers my pci slot for my wireless card so I had to drop it down to the next available slot. My motherboard is a BioStar 990fxe and says both the top slots are x16 but I'm getting way less performance from my 6870 in this slot than my 5770 in the top slot. I have re-installed the drivers when I installed the new card and I can't figure if I just need to say F* it and put it back into the top slot and buy an external WI-FI adapter or if there's something in the bios or anything else I can do. Any feedback will be greatly appreciated. Oh and the rig I'm talking about is my main rig in my profile. Thank you in advance guys.
Edited by GonzoMac817 - 12/6/12 at 8:28am
post #2 of 10
The second slot is meant for SLi or Crossfire not for primary solo card. So with that in mind using the 2nd slot will lose you performance as it is not meant for use with one card. Unfortunately you have no other option but to use the top slot for your GPU.
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post #3 of 10
Thread Starter 
Aw damn I was hoping that wasn't gonna be the case but that also crossed my mind. Thank you.
post #4 of 10
Hmm im looking at your motherboard, both those white slots are x16 it seems that is similar to my R2E board layout. It could also be that the 2nd slot only turns to x16 when in crossfire/sli dual card config, and by running only 1 card it may only run at x8 mode...

Or Maybe you have to go into the motherboard Bios when it is booting up and make sure that the slot is configured to run at x16? that is my only guess, tell us what happen....also i use an external wifi adapter and it works great..
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post #5 of 10
And while your in the BIOS,Make sure the 2nd PCI=E slot is set to be the primary slot.
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post #6 of 10
Quote:
Originally Posted by AMOCO View Post

And while your in the BIOS,Make sure the 2nd PCI=E slot is set to be the primary slot.

Is that possible ? I have a second x16 slot on my Sabertooth id rather use because my GPU is triple slot cooler. smile.gif
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post #7 of 10
Quote:
Originally Posted by Mr-Mechraven View Post

Is that possible ? I have a second x16 slot on my Sabertooth id rather use because my GPU is triple slot cooler. smile.gif

My motherboard BIOS has a function to change which PCI-E slot I want to use.
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post #8 of 10
Thread Starter 
Thank you guys. I'm gonna go and fiddle with my bios settings when I get home from work and will post the results in case it can help Mr-Mechraven.I honestly hate Biostars UEFI bios, seems quiet a few things are hidden with this motherboard.
post #9 of 10
I found through some searching that a guy used his HD5870 in the 3rd slot on a Sabertooth so he could use his sound card, so it seems promising. It would seem a shame for motherboards to have more than one X16 slot and not be able to use it.

But i might be upgrading to Intel in new year so i might not need to use 3rd slot, but before i do i will try it out and find out for certain if it indeed does work.
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BoxOfMagicPixies
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post #10 of 10
Thread Starter 
Just went to look in my bios, in my pci options I haven't found much but not sure what most of the options are for. Here's my options

PCI Subsystem Settings:

PCI Rom Priority - Legacy Rom
PCI Latency Timer - 32 PCI Bus Clock
VGA Palette Snoop - Disabled

PCI Expresss Settings:

No Snoop - Enabled
Max Payload - Auto
Max Read - Auto
ASPM Support - Disabled

So.... any ideas?
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