Age of Conan

I have a 8800 GTS 320MB  card and I want to SLI it but I heard you need the exact same card..... Does this mean the EXACT brand and everything? I was looking on newegg and there aer lke 742782 different kinds of 8800GTS 320MB with different speeds and everything. What do I do?

http://en.wikipedia.org/wiki/Scalable_Link_Interface

You will need 2 of the same card.

According to NVIDIA, they no longer need to be the exact same model EXCEPT for the 8800 GTX 512mb for some reason.  SO yes you can SLI with another one of those or any other NVIDIA based card ... but bear in mind that although it will speed graphics rendering.... the 320mb of texture memory is your real bottle neck and each card has to load all textures, the memory of the two cards DOES NOT combine.

SLI cards do not have to be the same brand, just get any 8800GTS 320mb card.  It can have higher clock speeds than the one you already own, but when put in SLI I think it will get knocked down to the lowest cards speed, so would be a waste to spend the extra money on a pre-overclocked card.  Always best to get the same exact card though....then you can do any modding, overclocking yourself and get the same specs applied to both cards 

looking for reference on NVIDIA site now...

retract my previous statement.... they have to be same model but can be different brand.... I must have read someone elses poor paraphrasing of NVIDIA FAQ

http://www.slizone.com/page/slizone_faq.html#c3

Can I mix and match graphics cards?
In order to provide optimal symmetric scaling, SLI technology requires the NVIDIA GPUs to match. For example, a GeForce 7800 GTX must be paired with another GeForce 7800 GTX. Likewise, a GeForce 6600 GT must be paired with another GeForce 6600 GT. However, using the latest Release 80 or later graphics drivers, NVIDIA GPUs sold by different manufacturers can be used together in an SLI configuration. For example, a GeForce 7800 GT from vendor ABC can be matched with a GeForce 7800 GT from vendor XYZ.

Can I mix and match graphics cards is one of them is overclocked by the manufacturer?
Yes. A GeForce 7800 GTX that is overclocked (for example BFG GeForce 7800 GTX OC) can be mixed with a standard clocked GeForce 7800 GTX.

Can I mix and match graphics cards with different sizes of memory?
While it is not recommended, NVIDIA does offer this flexibility using Coolbits. When purchasing a second graphics card, you should try to match the memory size so that you are ensured full value and performance from your purchase. For example, if your first card is a GeForce 6600 GT with 128MB of memory, you should purchase a second GeForce 6600 GT with 128MB of memory. However, using Coolbits (value set to 18), you can force both of the cards to use the lower of the two memory sizes and operate together in SLI mode. When dissimilar memory sizes are enabled to work together using Coolbits, the effective memory size for each card becomes the smaller of the two memory sizes. Instructions to enable this feature can be found here.

What power supply does NVIDIA recommend for an SLI system?
NVIDIA has extended its SLI-Ready certification program to include power supplies. The full list of SLI-Ready power supplies can be found here. In general, power supply recommendations vary widely depending upon the configuration and the desire for future upgradeability. More information about power supply selection can be found here.