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p45 vs x38/x48 crossfire benchmarks

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October 2, 2008 8:24:02 PM

Anyone know where i can find some? i haven't been able to locate any. Thanks.
October 2, 2008 8:30:43 PM

I don't have the links anymore, but what I found was that

The P45 was limited using 4850s.
In one benchmark, they did not use AA and the effect was small.
In another they did and the effect was very noticable.

Using older GPUs, there was not any difference.
I have not seen a test with anything faster than 4850s.

The x38/x48 did not show any significant difference between each other.
October 2, 2008 8:38:36 PM

Thanks for the information, i am interested in running two 4870's so im guessing it's a similar effect.
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October 2, 2008 8:42:16 PM

Yea for 4870's in crossfire X38/X48 is the only way to go unless u want alot of the performance wasted due to bandwidth limitations
October 2, 2008 9:14:53 PM

I have personal experience with two 4850's on a P45. The benchmark results are highly over exagerated on some of these sites on specific test. My numbers were within 3% of the ones on a X48. 3% is tossed up. However for 4870's only a fool would get a P45.
October 2, 2008 10:44:17 PM

spathotan said:
I have personal experience with two 4850's on a P45. The benchmark results are highly over exagerated on some of these sites on specific test. My numbers were within 3% of the ones on a X48. 3% is tossed up. However for 4870's only a fool would get a P45.


Thanks man that's what i needed to know.
October 2, 2008 11:04:37 PM

NinjaDMP said:
Thanks man that's what i needed to know.


Given the prices of P45's and X38/X48, if you were going for a Crossfire build, by all means go with an X38/X48 man. My ASUS P5Q Pro was $145 when I got it, their are X38's for about the same price now, and X48's around $215. They extra $40-60 is worth the full x16/x16 speed, espically taking future upgrades into consideration.
a b V Motherboard
October 2, 2008 11:31:51 PM

^Nice find. Toms should do a test on this.
October 2, 2008 11:39:47 PM

dirtmountain said:
http://www.legionhardware.com/document.php?id=761
this one disagrees with the first one out by tweaktown early on with immature drivers, but agrees with another i've seen translated from swedish.


The bottlenecking has nothing to do with drivers. New drivers cannot decrease pcie bus traffic. The difference lies in the settings the two use.

See this, for example:
http://www.legionhardware.com/document.php?id=761&p=2
Legionshardware use DX9, High quality, AA off, AF off.
http://www.tweaktown.com/articles/1472/7/page_7_benchma...
Tweaktown use DX10, Very High quality, AA/AF on.

More intensive graphics settings will stress the pcie bus and thus increase the difference seen. Both benchmarks are valid, just at different settings.

Although between the two, I would say Tweaktown's choice of using higher settings get more useful results. Crossfire setups are considered high end. Few people with setups such as dual 4870 are willing to turn off AA and AF completely. They paid so much for 2 cards so they can see the eyecandy. Turning them off defeats the purpose of crossfire.
a b V Motherboard
October 3, 2008 7:51:28 AM

It's getting to be an old argument now, but as pointed out prices are such that it's not as important any more.

Next month I suspect we'll see a new king with x58, which will be a relief as this can all be dropped :) 
October 3, 2008 9:00:54 AM

Nope next year everyone will be fighting over the X88 and the ATI 7870
October 3, 2008 11:09:55 AM

Next it'll be the P55 vs X58... This argument won't actually die down until x8 / x8 PCI-E configurations disappear.
October 6, 2008 1:44:12 PM

JDocs said:
Next it'll be the P55 vs X58... This argument won't actually die down until x8 / x8 PCI-E configurations disappear.


wtf, those are still around???? :lol: 
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