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Question about the COOLER MASTER RC-690-KKN1-GP

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Hello,
I plan on buying a COOLER MASTER RC-690-KKN1-GP.
Anyway I have some questions about this case in general. You know how there is a bottem cpu fan. Well what way should the air go outward/or inward toward the cpu?
Also I have a 4850 and was thinking about getting a 4850x2 so I could have 3 4850's in total. But now I'm thinking about getting one gtx 280 to start out and then eventually having three total. I was wondering if three gtx 280's would fit into this case?
Also wondering if a Zalman 9700 would fit into this case?
I don't think I'll actually get a 9700 because I plan on getting an I7 920 and using the stock cooler. I don't really plan on going over maybe 3Ghz. But you never know overclocking how things might turn out.


Current Rig

Newegg Rosewill $22 Rosewill R218-P-BK Case
Newegg Rosewill $45 Rosewill RP500-2 500W (has 31A @ 12v)
Ebay M2r32-mvp Motherboard I think at the time it was $82 (great deal at that time newegg was over $118)
Newegg AMD Athlon 64 X2 6000+ Windsor 3.0GHz Socket AM2 125W Dual-Core Processor Model ADX6000CZBOX - Retail $92.99 at the time
Newegg LITE-ON 20X DVD±R DVD Burner Black IDE Model DH-20A4P-04 - OEM $22.99 at the time
Ebay bought a hard drive remanufactured and went out in 2 weeks for $36
Newegg HITACHI Deskstar P7K500 HDP725050GLA360 (0A35415) 500GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM $59.99 at that time
Newegg HIS Hightech H485F512P Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail $174.99 at the time
Newegg Scythe DFS123812-3000 "ULTRA KAZE" 120 x 38 mm Case Fan - Retail $9.99 at the time + $7.00 Shipping
Ebay bought 2x new crucial technology pc2-6400 1 GB sticks and 1x used OCZ pc2-6400 1 GB stick for $44.99 + $6.99 Shipping. total of 3GB. Running 4-4-4-12 @ 2.15V.
Bestbuy Acer P191W for $129.99 + tax
Bestbuy Wireless keyboard and mouse 59.99 + tax (batteries haven't died yet after 5 months of everyday use)
and speakers I already had.


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Power supply Master

Fans on the front, bottom, and side of a case are generally intakes, and fans on the top and rear (including the PSU) are exhausts.
The RC-690 doesn't come with a bottom fan (120mm), but you can add one. It also doesn't come with either of two top fans (also 120mm). I added just one to mine.
That Rosewill PSU cannot handle multiple GPUs. Jonnyguru actually reviewed one favorably not too long ago, but they were surprised because the brand has historically been crap. Hardwaresecrets.com has some excellent articles on PSU anatomy, and an analysis of a cheap one and why/how it can and will kill a system.
PC Power & Cooling, Antec, Seasonic, and Corsair are among the better PSU brands.
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