Hi. I am building a system and im looking to use the OCZ GameXtreme 700W PSU. Will this support 2 8800GTX's? I am concerned about the wattage as well as the number of 6-pin connecters because I think GTX's need 2 each. Im not starting off with SLI GTX's but I plan to do it in the future. I am also wondering wheter or not to get a modular PSU. Will it be more expensive and save that much room? I would be using this with the Antec 900 case.
Yes the PSU will support two GTX's in SLI configuration. It has enough connectors, but I would try going for bigger wattage, GTX's can be beasts.
My PSU only has two 6-pin connectors. I thought EACH GTX needed 2
Yes, each GTX will need 2 6-pin power connectors, my mistake. So no, your current PSU will not be able to support 2 GTX's in SLI. This list of Power Supplies all have 4 6-pin connectors and will support GTX SLI. A Modular PSU with 4 6-pin connectors will cost you $300+ and IMO aren't really worth the extra hundred dollars for being not that much smaller.
My advice would be to go with the PC Power & Cooling Silencer 750 Quad for two 8800GTXs. It's a bit more expensive then the GameXStreme and the cables aren't as long but it's a better PS. If it were two 8800GTS cards I would say maybe the OCZ would be better, but not with the spec you mentioned.
Cheeseking25;3989672the PSU goes on the bottom in that case...
Just remembered that, my mistake, edited the post. I still think the PCP&C would be better though as the main priority should be fitting the PS to the cards used. Last I spoke to PCP&C about cable length they said several customers had suggested they make them longer and they were considering it, so you might want to ask them if they have or plan to.
will the wattage on the PSU be ok? and also will there be any difference between a 60AV rail and four 12AV rails?
With wattages it's best to look at more than just the advertise wattage but as well what wattage it can sustain at peak loads and the peak wattage. It's also good to note the amperage available on any given 12v rail. There the PCP&C excels, which is what you want for two power hungry cards like the 8800GTXs.
For the little extra you pay the Silencer 750 Quad is a good investment and if you add the 50 watt nominal difference to it's peak watt capability it's more like 100 actual watts more. And that's without factoring in the huge 60A single rail construction, which ensures all high current draw components will have enough juice.
Besides all that for what the Silencer 750 Quad has it's priced very well too compared to other units of similar and even lesser quality. The more you research modular cables and multiple rails, the more you'll find they are more hype than necessities. PCP&C puts all their design elements into things that have actual performance benefits.
ive been researching the PSU and it looks good. Ill probably get this one for my system.