Hi everyone,

I have a question for you, but let me FIRST explain the situation:
I have a gaming PC (specifications are in the dxdiag in the attachment) with basically a ASUS P7P55D motherboard, INTEL Core i5-750 and a Nvidia Geforce GTS 250, running a good old Windows XP SP3.
This pc is 2 years old and I wanted to upgrade it a little bit, like get a new GPU or maybe a little more RAM in case I might get Win7 or something. The RAM ain't the PROBLEM, I STILL have 2 open slots, so I can get 4 GB more if I want to. I simply didn't want to have to throw away my perfectly working GTS250. It's like throwing away a pie or the Mona Lisa or something inbetween 

I wanted to get me a GPU from the Nvidia Geforce 500 series (like e.g. the GeForce GTX 560 Ti)

So I was thinking: isn't it possible to make those two GPU's work together?
I don't want them to work next to each other, simply make them enforce the other one (making games go faster and stuff).

Is this possible with this setup, if so how?
If not, what is possible then?

Thanks in advance!

Bennieboj


ps: this is the first time I'm deling with multiple GPU's so if I'm saying something stupid, please be gentle 

[regaining space - attachment deleted by admin]http://www.asus.com/Motherboards/Intel_Socket_1156/P7P55D/#specifications
It only supports ATi quad Crossfire-there is no nVidia SLI support.


http://www.slizone.com/page/slizone_learn.html
This is what you want-run 2 (or more) GPUs in tandem so you will get better performance out of your games/programs. It's fully possible, but will only work with 2 identical GPUs. Make sure you have a beefy enough power supply-1 GTX 580 already requires 363 Watts on load (http://www.bit-tech.net/hardware/graphics/2010/11/09/nvidia-geforce-gtx-580-review/8), and in an SLI config I'd imagine you'd at least need an 800 W PSU to power the rest of your system.


However, some enthusiasts have released a custom BIOS which allows you to enable SLI on your motherboard:
http://www.tweaktown.com/news/14362/enable_sli_support_on_your_vanilla_asus_p7p55d/index.html
BEWARE: IF YOU ARE NOT FAMILIAR WITH FLASHING YOUR BIOS PLEASE DON'T DO SO WITHOUT FIRST UNDERSTANDING THE EXACT STEPS PERTAINING TO YOUR MOTHERBOARD-YOU MAY BRICK YOUR MOTHERBOARD IF YOU ARE NOT CAREFUL.Thanks for the well documented reply

So if I got it right, I can't tandem my current card and another new card...
So I'll have to get rid of my old GPU and then get a new one(or two depending wether I want to tandem or not)
Maybe the PC show'll buy my old card (I really hope they do..)

I guess I'll buy a new GPU and leave it that way, no dual GPU for me with this motherboard.
My power supply says it supplies 450 Watt....
As you said that having one GTX 580 requires 363 Watts, WOULD you think it'd be possible for me to get a GTX 580 or do I also need a new power supply?http://www.nvidia.com/object/product-geforce-gtx-580-us.html

nVidia recommends you to have at least a 600 W power supply, with 1 6-pin and 1 8-pin PCI-E power connector. That sure is one beefy card.
If you are on a budget, you really might want to consider the Radeon HD 6850:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102908
Provides the best price-performance ratio.

Requires only 1 6-Pin PCI-E connector and an upgrade to at least a 500 Watt PSU:

from http://www.videocardbenchmark.net/gpu.php?gpu=Radeon+HD+6850
You can also use http://www.hwcompare.com to compare the individual specs of every single graphics card on the market.Ok thanks for the info, I'll think about it