WildW wrote:Mine has a similar 200W PSU that is making me nervous. The case only has mounting holes for a micro-atx/SFX power supply which are expensive for no good reason...and even if I get a new one I'll have to MacGyver together a way to mount the CPU duct/shroud as the PSU fan is the only one in the machine. So nice and quiet though.
It looks like a SFX PSU would fit where the old micro ATX PSU is, but it just falls short in measurement. The other problem is you will notice that 200W PSU has a proprietary bracket stabilizing it to the side of the case. So when you remove the original PSU there is no stabilizing lip like in most cases meaning a new PSU would only have the four screws holding it up which could be sketchy. You can find cheaper SFX PSUs on Ebay, etc., but from what I have researched their components are terrible and this is a much smaller package than your standard ATX PSU so you want high quality components. I found the Corsair models expensive, but using high quality components and also uses a thermal sensing cooling fan for quiet operation. They also happen to have modular wiring which I prefer. If you look at your case there are actually four standard ATX PSU screw holes already on the back. One of the holes (the offset hole) is hidden behind the rear sticker. What I did was ordered the Corsair SF450 450W SFX PSU (they also make a 600W model) and then ordered the ATX to SFX mounting bracket to install it to this case. Not only does the bracket allow you to mount the SFX PSU to the Gateway 450 case it also stabilizes the PSU because it has a metal lip. Once installed with the ATX to SFX bracket it is solid without any give and it almost fits the hole in back. Get back to that later. Corsair makes an ATX to SFX bracket, but I liked the SilverStone bracket design much better because of the stabilizing metal lip which the Corsair lacks. Also, you could look at SilverStone SFX PSUs as they are a bit cheaper, but still have decent quality from what I have read. The Corsair SFX PSU does get better ratings overall though, but they're expensive. Back to the hole in back. The Corsair almost fits perfectly with the bracket, but the edge of the power switch on the PSU doesn't quite clear so I am going to dremel out a tiny bit of metal so the PSU sits flush against the case. You really don't have to do this as the SF450 fits almost perfectly except for a tiny gap left where the edge of the power switch hits the edge of the hole in back. The power switch functionality is unaffected by this. It's solid either way. I am just a little more OCD than most people. I will show all this in the video.
So why not just install a regular ATX PSU since there are ATX screw holes already there? Because they are upside down (thank you Gateway). So the offset screw hole is at the bottom rather than the top like in most cases. This means any ATX PSU you buy for this Gateway model the PSU cooling fan will be facing upwards rather than down which wont be near as effective to cool the case. You could buy an ATX PSU with front to back cooling, but they are a bit harder to find and I prefer the cooling fan to be sucking air from the bottom to move the air in a less linear fashion. Also, with a larger ATX PSU you will have to either weld a metal lip to the case to stabilize the PSU or drill holes in the case so you can screw in some sort of jerry-rIgged bracket or lip. The biggest problem with a regular ATX PSU is good luck getting the power plug and switch to fit that small opening in back properly without some dremel metal work. The SFX solution is much cleaner, more stable and a lot less work. I am ditching that fan shroud since there is a rear 80mm exhaust fan port. The 440BX motherboard has a secondary 3-pin fan interface. I personally am upgrading the CPU as well with a slotket and a Coppermine CPU and adding a CPU fan/copper heatsink.
I found all of this to be the best solution for me with this case without a lot of metal work or drilling new screw holes which I like to keep to a minimum.
Here are the parts you can research yourself.
SilverStone ATX to SFX bracket:
https://www.amazon.com/SilverStone-Technology … 7923WZGT7SCTHA8
Corsair SFX PSUs:
https://www.amazon.com/dp/B01CGGOXWQ/ref=twis … ding=UTF8&psc=1
SilverStone SFX PSUs:
https://www.amazon.com/SilverStone-Technology … Bsfx%2Bpsu&th=1