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[Tweaktown] 8x PCIe Limits Highend GPUs

post #1 of 32
Thread Starter 
Originally posted by Ragheed: http://www.overclock.net/ati/346646-...le-if-you.html

Give REP to RagHeed and not me about the article!


http://www.tweaktown.com/articles/14...ion/index.html



Quote:
This is really a very interesting article and is something people need to be taking note of. The first thing you need to be checking is if you're reading a review where Crossfire is being tested. Make sure that the board there using is a x16 / x16 motherboard. The results really do speak for themselves and it’s clear that there is a performance difference between a x16 / x16 configuration which the X48 offers, and the x8/x8 one on the P45.

If you’re really thinking about going down the Crossfire path, we would be highly recommending that you spend the extra money to go to an X38 or X48 based motherboard over the P45. Of course, if you’re not then it doesn’t really matter. With one card the P45 runs at x16, which is exactly what you want.

The thing is, the X48-DQ6 is only about 10% more expensive, so you could easily say that you should just spend the extra money and get that. You may in future go Crossfire without knowing it yet, but admittedly the P45-DQ6 does have some very cool features such as the new ICH10R controller, loads of SATA ports and just some really funky new add-ons like the power buttons on board. Of course, we will cover all these in more detail in our full motherboard review at a later date.

Before you rush out and buy that P45 board thinking that x8 / x8 will be just fine, sit back and have a think if you’re really aiming to go down the Crossfire path in the near future.

The P45 has PCIe 2.0 so that means x8 PCIe 2.0 has the same bandwidth as x16 PCIe 1.x. Now the question is does x16 PCIe 1.x bottleneck these cards?
Edited by DuckieHo - 6/19/08 at 12:34pm
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post #2 of 32
Pretty obvious points made but it is good info.
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post #3 of 32
Very interesting read, it's good to know we've finally broken the x8 barrier. Still, P45 looks great for single-PCI-e card users.
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post #4 of 32
Thats a pretty decent difference in some games.
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post #5 of 32
I wonder if NVidia's 200 series will experince simular effects on a 8x 8x board... not like I have the money for them lol
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post #6 of 32
Thread Starter 
Quote:
Originally Posted by FireMarshallBill View Post
I wonder if NVidia's 200 series will experince simular effects on a 8x 8x board... not like I have the money for them lol
The 8800GTX was already limited by x8 PCIe 1.x.


My question is still open about the P45 and PCIe 2.0.....
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post #7 of 32
I still wanna know why my 3D Mark06 score increased when I swapped my X2 into my 4x slot.
See
Edited by grunion - 6/19/08 at 12:17pm
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post #8 of 32
Quote:
Originally Posted by DuckieHo View Post
The 8800GTX was already limited by x8 PCIe 1.x.


My question is still open about the P45 and PCIe 2.0.....
I saw a recent review concerning the matter, it seemed there was a slight benefit of 16X PCI Express 2.0 over 16X PCI Express 1.1.

*Looking*

Anyways this article IS comparing 8x PCI Express 2.0 (equivalent to 16x PCI Express 1.1) to 16x PCI Express 2.0.
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post #9 of 32
Is a single high-end card bottlenecked by an 8x PCIe 2.0 (16x PCIe 1.1)?
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post #10 of 32
Yea good stuff. The real killer is the 16x/4x on the P35 chipset. I had a P35 based board before my Maximus Formula arrived.....SUPER slow comparatively. I think it was somewhere around %15-20 slower at times....
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