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Maximus 2 mobo, Which video card/s to run at full 16X

Last response: in Motherboards
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July 9, 2009 9:24:36 PM

Hello people, I am new to this forum thing, but I need some professional advice. I have built about 6 computers now and have enough knowledge to make me dangerous. However I am still in the past with the new graphix cards. My newest creation I am working off of the ASUS maximus 2 formula P45 mobo w/core2 duo 3.0 (stock), 8 gigs ram and a turbocool 510SLI power supply. I have a P45 chipset of course and I am using an old GPU (garbage) to get me running. I would like to know what is the best setup for running 1 or 2 cards in crossfire mode for full 16X.

I refuse to pay the money required for the nvidia single.

I have read some articals on the ATI 4870 and 4870X2

I need some one to advise me wheather it is more practical to run 2 - 4870 /or 1 - 4870X2 to allow optional upgrade without having to scrap the card when something new comes out.

I heard that with this chipset I can only run 8X with 2 4870. If this is the case would it be better to run 1 4870X2 and upgrade later if desired?

Also I have seen that the 4890 runs cooler with an additional heat pipe and preforms slightly better then the older 4870.
Can I run 2 - 4890's at 16X or will it force it to 8X

Over all I want what everyone wants the best bang for your buck.
I do not want to waste money and would like to get igleast 5 reliable years if not more out of it.
Thanks for any help you may provide.

a b Ĉ ASUS
a c 169 U Graphics card
a c 135 V Motherboard
July 10, 2009 7:40:54 AM

http://www.tomshardware.com/forum/245454-33-crossfire-f...

"Dual 8x is a very good configuration too,it doesnt have alot of difference with Dual 16x and its cheaper too.
Chipests like Nvidia 750i SLI, Nvidia 650i SLI,NVIDIA 570i SLI, NVIDIA nForce4 SLI, ATI Radeon Xpress 200, Intel 975x and ONLY 2 Intel P35 boards(ASUS BLITZ FORMULA and ASUS BLITZ EXTREME) support Multi-GPU at dual 8x mode.
However for cards like radeon HD 48xx series,its better to get a Dual 16x motherboard because it performs better."

If u use one card on a P45 board it will operate @ 16x but if u want to use CrossFire then both cards will operate @ 8x,so i say go for a HD 4870X2 which is 0-15% faster than 2 HD 4870s in most games and requires only 1 slot so it will run @ 16x speed.

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July 10, 2009 4:06:51 PM

id go with CF HD4850 1gb. You can have two of these for under 200$
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a c 106 U Graphics card
a b V Motherboard
July 10, 2009 4:21:14 PM

If you get a single 4870 then it will use all 16x lanes, assuming you put it in the first 16x slot and not the secondary slot which can only steal 8 lanes from the primary. As far as two 4870s vs a single 4870X2 the X2 is better as it uses slightly less power, since it's all on one PCB, and is designed so that both GPUs get 16x lanes to communicate with each other as opposed to two 8x lanes that two 4870s would have on your P45 board. There isn't much advantage to running another 4870X2 latter on as crossfire has too much CPU overhead right now, as well as inferior multithreading, to really scale well beyond 2 GPUs. It should be some time before you really need anything more than the 4870X2.

Go with a 4870X2 and be happy.
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a b Ĉ ASUS
a c 169 U Graphics card
a c 135 V Motherboard
July 10, 2009 8:24:45 PM

boulard83 said:
id go with CF HD4850 1gb. You can have two of these for under 200$


The OP stated that he has a P45 board which supports CF @ Dual 8x so its better to go for a card like HD 4870X2 so he wouldn't suffer from some performance hits that dual 8x has(Compared to dual 16x)
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July 10, 2009 8:43:55 PM

Dual 8x VS Dual 16x yeald near NO DIFFÉRENCE.

http://www.tomshardware.com/forum/246438-30-mobos
Is this a post from YOU maziar telling this ? .... YESSSS !

LOTS of review prove that there is near no difference between 16x and 8x. The only place in a review where ive saw a real difference is with the 3 SLI/CF using 16X-16X-4X vs 16X-8X-8X, the 4x was slowing the system. but not the 8x. And a mobo with TRUE 16X-16X-16X was Equal to the 16X-8X-8X and sometime slower ....


Edit 1: Newer test wth EVGA Classified
http://www.hardwarecanucks.com/forum/hardware-canucks-r...
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July 10, 2009 10:30:26 PM

Thank you so much for your help guys and gals. It sounds like 1 - 4870X2 is the most cost effective and performance way to go. talk later.
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a b U Graphics card
a b V Motherboard
July 11, 2009 4:07:01 AM

pipelayer83 said:
Hello people, I am new to this forum thing, but I need some professional advice. I have built about 6 computers now and have enough knowledge to make me dangerous. However I am still in the past with the new graphix cards. My newest creation I am working off of the ASUS maximus 2 formula P45 mobo w/core2 duo 3.0 (stock), 8 gigs ram and a turbocool 510SLI power supply. I have a P45 chipset of course and I am using an old GPU (garbage) to get me running. I would like to know what is the best setup for running 1 or 2 cards in crossfire mode for full 16X.

I refuse to pay the money required for the nvidia single.

I have read some articals on the ATI 4870 and 4870X2

I need some one to advise me wheather it is more practical to run 2 - 4870 /or 1 - 4870X2 to allow optional upgrade without having to scrap the card when something new comes out.



Here is the EXACT information you need:

http://www.tomshardware.com/reviews/crossfire-pci-expre...
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a b U Graphics card
a b V Motherboard
July 11, 2009 4:07:51 AM

Maziar said:
http://www.tomshardware.com/forum/245454-33-crossfire-f...

"Dual 8x is a very good configuration too,it doesnt have alot of difference with Dual 16x and its cheaper too.
Chipests like Nvidia 750i SLI, Nvidia 650i SLI,NVIDIA 570i SLI, NVIDIA nForce4 SLI, ATI Radeon Xpress 200, Intel 975x and ONLY 2 Intel P35 boards(ASUS BLITZ FORMULA and ASUS BLITZ EXTREME) support Multi-GPU at dual 8x mode.
However for cards like radeon HD 48xx series,its better to get a Dual 16x motherboard because it performs better."

If u use one card on a P45 board it will operate @ 16x but if u want to use CrossFire then both cards will operate @ 8x,so i say go for a HD 4870X2 which is 0-15% faster than 2 HD 4870s in most games and requires only 1 slot so it will run @ 16x speed.


Why use generalizations when you can actually look at REAL NUMBERS?

http://www.tomshardware.com/reviews/crossfire-pci-expre...
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a b Ĉ ASUS
a c 169 U Graphics card
a c 135 V Motherboard
July 11, 2009 10:36:02 AM

boulard83 said:
Dual 8x VS Dual 16x yeald near NO DIFFÉRENCE.

http://www.tomshardware.com/forum/246438-30-mobos
Is this a post from YOU maziar telling this ? .... YESSSS !

LOTS of review prove that there is near no difference between 16x and 8x. The only place in a review where ive saw a real difference is with the 3 SLI/CF using 16X-16X-4X vs 16X-8X-8X, the 4x was slowing the system. but not the 8x. And a mobo with TRUE 16X-16X-16X was Equal to the 16X-8X-8X and sometime slower ....


Edit 1: Newer test wth EVGA Classified
http://www.hardwarecanucks.com/forum/hardware-canucks-r...


I think u misunderstood my post :)  i said before and i am saying it now that the difference between Dual 8x and Dual 16x isn't much but for cards like
HD 48xx series,i have seen "SOME" performance hit when going from dual 16x to dual 8x,(Check XBITLABS reviews for HD 48xx cards in CF mode)but again i say it the difference isn't much between them
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a b Ĉ ASUS
a c 169 U Graphics card
a c 135 V Motherboard
July 11, 2009 10:39:44 AM

Crashman said:
Why use generalizations when you can actually look at REAL NUMBERS?

http://www.tomshardware.com/reviews/crossfire-pci-expre...


Thanks for the link,it shows that in some areas there is a performance hit with dual 8x compared to dual 16x.

Also Crashman u are talking about the comparison i made between the performance of 1 HD 4870X2 and 2 HD 4870s ? if so then that numbers were from one of the reviews i read(I think it was tomshardware review)
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a b U Graphics card
a b V Motherboard
July 11, 2009 9:25:55 PM

Maziar said:
Thanks for the link,it shows that in some areas there is a performance hit with dual 8x compared to dual 16x.

Also Crashman u are talking about the comparison i made between the performance of 1 HD 4870X2 and 2 HD 4870s ? if so then that numbers were from one of the reviews i read(I think it was tomshardware review)


I was tackling the question from the motherboard side, not the GPU side. The GPU's he asked about were 4870's, so I brought forth an article showing that the difference between x8 and x16 slots on a 4870 is minimal.
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a b Ĉ ASUS
a c 169 U Graphics card
a c 135 V Motherboard
July 12, 2009 10:58:24 AM

I see :)  thanks it was a very useful link,good read indeed :) 
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a b U Graphics card
a b V Motherboard
July 12, 2009 12:01:54 PM

Maziar said:
I see :)  thanks it was a very useful link,good read indeed :) 


I'm glad you found it useful!
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