I am interesting in acquiring a MultiGPU architecture with 2 GTX280 cards.
What is the configuration that you would advise me (CPU, motherboard, etc…)? And if you have a reference to a Dell configuration that suits my needs, it will be with a great help for me.
If you only want to use GPUs for calculation, you need a 3PCIe-motherboard with 2 of them in 16x. In this way, you could plug a third, but not so powerfull, GPU for your display (nvs quadro for example). Look for a chipset using the PCIe 2.0 since GTX2xx use it.
To manage 2 GPUs efficiantly, you need at least a dual core (one thread per kernel/GPU). Last recommandation, be careful to your power supply.
You should made your configuration yourself, Dell configurations are not suitable to my mind (maybe the XPS serie but it is a player PC).
The biggest problems with putting 2 GTX 280’s in a store-bought workstation as I see it are power and cooling. The 7400 has a 980W power supply, so you should be fine there, the only question is whether they provide 8-pin PCIe power cables: you’ll need 2 8-pin and 2 6-pin ones. It is unlikely that the system comes with any: none of the GPU options there use 8-pin power connectors, as far as I know. Sure, you could use adapters, but my experience with dell is that they only provide the power connectors that are absolutely needed for the system’s configuration so there aren’t likely going to be enough molex connectors around to scrounge up an adapter to 2 8-pin power connectors.
Judging by the photos on Dell’s website, the cooling should be fine. There is a fan blowing straight across the GPUs.
If you truly need a store-bought system with 2 GTX 280’s you are going to have to turn to the enthusiast gaming market. Falcon northwest will even build you a system with 3 GTX 280s :)
The Dell guy was unable to explain to me why we couldn’t have a 7400 with GTX280 cards, thank you MisterAnderson42 and tmurray. So it is better to get a configuration already equiped with the cards rather than trying to put them on an existing one.
I found some Alienware configurations with 2 and even 3 GTX280.