I'm getting a two slot fans to help cool my brother's 8800GT. They have a 4-pin connector. I'm wondering, does this plug into the power supply or the mobo? I just looked at a picture of the motherboard he is buying, and it doesn't appear to have a 4 pin connection (that doesn't necessarily mean it isn't there)...
I don't know of any slot fans that plug into a 4-pin connector on the motherboard. There are processor fans that take a 4, but that is it. So it does need power supply for the 4 pin. Some of them come with an adapter to use a 3 pin from the motherboard. I think that Zorg gave you the best description, being a picture.
Almost forgot, why do you need to cool his 8800GT with to slot fans? It would be more efficient to use an after market cooling solution. It will cost a little more than 2 slot fans. It is worth it though, they do a far superior job. Here is a link to many of them. http://www.xoxide.com/vgacoolers.html . http://www.xoxide.com/thermaltake-duorb-vga-cooler.html this one in particular gets good reviews, if paired up with some ram sinks.
After market cooling solutions void the warranty/step up, that's why I am not considering them. Two slot fans moving 30+ CFM each, and the GPU fan ramped up via Riva, should be more than enough. Yes, Zorg, it is a 4pin Molex. I only asked because I don't actually have the computer or the components in front of me. I'm doing the research, and when I go visit the family over X-mas I'm going to hook everything up for him.
How many of those 4pin connections does a power supply typically have?
As rgeist554 said it varies. Often the fans will have a male on one end of the Molex and a female on the other end so you won't loose a Molex in the process. You will have to check the fans to see if they do.
After market cooling solutions void the warranty/step up
EVGA is the only card manufacturer I know of that has a Step Up program and thier warranty is not voided by modding the card as long as you keep the original cooler to put back on in case you have to RMA.
The PSU is 750 watts. It's a falcon northwest fragbox. I'm not sure exactly the brand they use, but it shouldn't be a cheap one. This is for my brother, so I don't actually have the comp in front of me to investigate.
Needless to say, I picked up a few 1x4pin to 2x4 pin extensions, just incase. I'll run these coolings and up the fan via Riva, and if that's still not enough I'll investigate an aftermarket cooler. I'm not interested in OCing the card or anything like that.
Well then you certainly won't have a power problem. Like I said, those Molex connectors on the fans probably are a pass through, so you shouldn't need any extra splitters. Also, a 750W should have enough Molex connectors anyway.