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ASUS P5Q Pro - (P45) - Crossfire?

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June 26, 2008 7:04:44 AM

I am doing a new system build and I was given the recommendation of going with:

ASUS P5Q Pro LGA 775 Intel P45 ATX Intel Motherboard - Retail
* CPU Type: Quad-core / Core 2 Extreme / Core 2 Duo / Pentium
* FSB: 1600/1333MHz
* South Bridge: Intel ICH10R
* Number of Memory Slots: 4×240pin
* Memory Standard: DDR2 1200
* Maximum Memory Supported: 8GB
* Dual Channel Supported: Yes
* PCI Express 2.0 x16: 2
* Model #: P5Q Pro
* Item #: N82E16813131299
* Return Policy: Limited 30-Day Return Policy

I keep seeing links to the tweaktown review of a P45 board every time someone talks about P45 crossfire. In that review it said somethink like P45 boards are not good for crossfire because of the 2nd PCIe running at x8. Based upon the specs taken from newegg, doesnt it look like this board would be a good crossfire candidate? Am i missing something? Has anyone tried crossfire with this board? (I am new and i dont want to be a pioneer! :)  )

The reason why im asking is because i am getting ready to build and this board is so cheap. ($150) Why is it so cheap?

If this board would be bad for crossfire or there is some reason i should go with an x48, then from what i gather, this is a solid board for $225:

GIGABYTE GA-X48-DS4 LGA 775 Intel X48 ATX Intel Motherboard - Retail

* CPU Type: Quad-core / Core 2 Extreme / Core 2 Duo / Pentium
* FSB: 1600/1333MHz
* South Bridge: Intel ICH9R
* Number of Memory Slots: 4×240pin
* Memory Standard: DDR2 1200
* Maximum Memory Supported: 8GB
* Dual Channel Supported: Yes
* PCI Express 2.0 x16: 2
* Model #: GA-X48-DS4
* Item #: N82E16813128336
* Return Policy: Limited 30-Day Return Policy

If you were doing a build and thinking about doing crossfire down the road 48xx, which one would you chose and why?

-Hypnotico
a b V Motherboard
June 26, 2008 8:35:12 AM

Check out this link to the P5Q-E specs on the ASUS site:

http://usa.asus.com/products.aspx?l1=3&l2=11&l3=709&l4=0&model=2267&modelmenu=2


"2 x PCI Express 2.0 x16 slots, support ATI CrossFireX%u2122 technology, at x8 link
(PCIe x16_1 blue, PCIe x16_2 black*)
1 x PCI Express x16 slot at max. x4 link(black)
2 x PCI Express x1 slots
2 x PCI slots
*PCI Express x16_2 slot (black at max. x8 link)"

I guess what they are saying is that while the slots are individually x16, once you crossfire they are x8... Ah no, I see.

The blue slot is x16, and the two black slots add up to x16:p 

Ya see there are three slots total, it's basically a lie. You can only crossfire on the two black slots.
June 26, 2008 10:13:19 AM

Thanks for taking the time to respond! ..but hang on: The board you are speaking of and the one I am quoting are different. There is a lot of confusion about these P45s...and the latest boards are not even on the ASUS website...how lame is that? There is a pic at newegg:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Later..

- Hypnotico
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June 26, 2008 8:25:11 PM

get x38/x48 mobo... they allow both slots to run at x16... ima get an x38 myself...
June 27, 2008 9:52:19 PM

or dont crossfire and get a better video card ?

just my 2 cents tho :) 

but at lower resolution ( 1680 * 1050 or lower) X48/x38 and P45 boards are close in term of crossfire perfomance
a b V Motherboard
June 27, 2008 10:04:31 PM

hypnotico said:
In that review it said somethink like P45 boards are not good for crossfire because of the 2nd PCIe running at x8. Based upon the specs taken from newegg, doesnt it look like this board would be a good crossfire candidate? Am i missing something?
What that Tweaktown reviewed actually showed was that above 1680x1050 resolution the x8 lane CF option started to lag behind the X16 lane CF option.
Thats like saying the X38/x48 option is BETTER than P45 - but its NOT saying that X8 P45 CF is bad. Can you say the E8400 CPU is good because it runs @ 3.0Ghz but the E8200 is bad because it's 2.66Ghz?
CF with monitors 24" and above have a small advantage on X38/X48 motherboards. 22" and below it doesnt appear to be much difference.
Would 2x 4850CF on X48MB beat out 2x 4870CF on P45 MB? Not likely [:wr2:5] - so that idea that CF on P45 being "bad" is wrong.
It's like anything else - how much do you want to pay for your hardware? What is a few extra FPS worth to you?
June 27, 2008 10:48:16 PM

Thanks for the responses!

WR2: I see what you are saying, thanks for the detail.
I am doing a build and will go the x48 route. I do plan on using a 24in monitor. Might do crossfire down the road. The reason i made the post was because i thought that maybe certain P45 mobos would be able to do crossfire with both running at x16. Sounds like x48 is the better way to go for me. I just was intregued by the p45s due to their newness and what not...

- Hypnotico

!