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P55A-UD3 and Graphics Cards

Tags:
  • Gigabyte
  • Graphics Cards
  • Crossfire
  • Motherboards
Last response: in Motherboards
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Anonymous
a b U Graphics card
a b V Motherboard
December 19, 2009 7:50:10 AM

OK gang, I need a hand here understanding a feature of my motherboard. I've read that it's Crossfire X compatible and that it should work well when/if I run my 2 XFX 4770's in that mode. I know they are lower end cards and I probably am worried about nothing, but I've also heard that if you run SATA III and USB 3 you will lose 4 lanes from the PCIEx16 channel and basically make crossfire useless. I've also heard that it will disable the second card if you use SATA III and USB III simultaneously. I mean, this doesn't make sense to me. What if I wanted to crossfire a better card? Say a 4890? Can someone please shed some light on this, or more information on how the P55 works in general?

I am no noob, but I am no genius either so I guess "dummy talk" would be the best answer. My twin brother is using my rig with my 4770's so throwing them into my P55A-UD3 isn't an option at the moment. That would probably be the most direct and efficient way of testing to see what bandwidth I would be running at. But I just am looking for answers and experiences folks have had.

Any comments are welcome.

More about : p55a ud3 graphics cards

a b U Graphics card
December 19, 2009 3:06:11 PM

when dual gfx are used , the sata and usb work in 2.0 mode , it does not disable the second gfx at all ...

u will have :-

single gfx card at x8 , sata3 and usb 3 at full 3.0 speed.
OR
dual gfx cards at x8 each , sata and usb will work in 2.0 mode , like previous gen ports .
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a b U Graphics card
December 19, 2009 3:09:57 PM

but wait , the ud3 has the second pcie as x4 only , of the p55 chipset .... the above post is applicable to p55a ud4p ...

for ud3 , it would always be single card at x8 , second card at x4(CF not recommended) , and sata and usb at 3.0 .

gigabyte takes the bandwidth from cpu's pcie lanes for the new sata/usb , asus takes this bandwidth from p55 chipset .... asus is a better solution , as u can get dual x8 + sata/usb in 3.0 speed , but as they use a plx bridge chip with the p55 chip , their mobo's are somewhat costlier ...
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a b U Graphics card
December 19, 2009 3:10:11 PM

i hope this helps !
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Anonymous
a b U Graphics card
a b V Motherboard
December 19, 2009 5:55:10 PM

Not really. My single card in this board is reported as running at 16x when it's stand alone at the moment. So it looks like your wrong.
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Anonymous
a b U Graphics card
a b V Motherboard
December 19, 2009 6:32:32 PM

Everything is USB 2.0 that I have. Mouse, Keyboard, Webcam, External 1TB hard drive, Mic, Wireless Adaptor, iPod, Printer, Game Controller. And still says I'm running x16. Do you have this board or are you guessing?
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Best solution

a b U Graphics card
December 19, 2009 6:36:50 PM

even when u do connect a 6gb/s hdd or a usb3.0 disk , the x8 will be enough for most single gpu cards , never use dual gpu card for example the 5970 in it .
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a b U Graphics card
December 19, 2009 6:41:45 PM

the ports need to be connected to a 3.0 enabled device to make them work in that mode , otherwise the gfx work at usual 16x .. of course , ure using gpuz for the mode check , isnt it ?
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Anonymous
a b U Graphics card
a b V Motherboard
December 19, 2009 6:44:31 PM

Yeah, of course! I don't think I'll be running sata III or usb III any time soon so I guess I should leave this thread alone and just be happy with what I have until maybe summer when I upgrade again.
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