350-400w TFX PSU Recommendation?

[tobin48]

Hi I wanted to upgrade the PSU on my Dell Optiplex 780 SFF (Small Form Factor) and I was wondering if any of these TFX PSU's would be compatible? I'm new to upgrading PSU's so I'm really not sure.

SeaSonic 350w
http://www.ebay.com/itm/like/311320915849?lpid=82&chn=ps

Athena Power 400w
http://www.ebay.com/itm/like/350807612191?lpid=82&chn=ps

Solid Gear 350w
http://www.amazon.com/Solid-Gear-TFX12V-350-Watts-SDGR-TFX350/dp/B00A8ZZWYQ

Original Dell Optiplex 780 SFF 235w (For Comparison)
http://www.ebay.com/itm/Dell-Power-Supply-PSU-H235P-for-Dell-Optiplex-980-960-780-760-380-SFF-US-/171412611310?pt=LH_DefaultDomain_0&hash=item27e8fce0ee

 

[Dylzan]

The Seasonic is the best unit, though it may not fit as the Dell PSU looks an odd shape.

 

[ko888]

Dell uses a proprietary form factor for their SFF systems.

That notch in the L-shaped PSU's case is where the optical drive is located.

If the TFX form factor PSU extends beyond where the notch-out begins then it won't fit properly into that SFF computer case.

 

[tobin48]

Dell uses a proprietary form factor for their SFF systems.

That notch in the L-shaped PSU's case is where the optical drive is located.

If the TFX form factor PSU extends beyond where the notch-out begins then it won't fit properly into that SFF computer case.

Thanks for replying, I opened up the Optiplex myself and took a look inside. You are right that the notch portion is where the optical drive is but the optical drive seems to float above of it a few centimeters. I took some dimensions, and the Optiplex PSU is 8 inches in length (2 inches on the notch part), 2.5 in width, and 3 in height with some space left on the top.

Optiplex PSU:
8L x 2.5W x 3H

Dimensions of the other PSU's.

Athena Power:
7L x 2.5W x 3.4H

Solid Gear:
6.9L x 2.2W x 3.2H inches

SeaSonic:
7.3L x 2.5W x 3.4H

It seems that the Solid Gear has the most wiggle room. Should I just go with that one?

In the picture of the Opitplex interior, you can see that from where the notch begins you can go at least one inch without the top or length of any PSU hitting the optical drive. Since the Dell PSU is 8 inches in length, I think the Solid Gear PSU should fit in just fine being just 6.9 inches in length and also smaller in other dimensions than the Dell PSU. Perhaps the Athena might fight in as well. Recommendations?

 

[Dylzan]

Dell uses a proprietary form factor for their SFF systems.

That notch in the L-shaped PSU's case is where the optical drive is located.

If the TFX form factor PSU extends beyond where the notch-out begins then it won't fit properly into that SFF computer case.

Thanks for replying, I opened up the Optiplex myself and took a look inside. You are right that the notch portion is where the optical drive is but the optical drive seems to float above of it a few centimeters. I took some dimensions, and the Optiplex PSU is 8 inches in length (2 inches on the notch part), 2.5 in width, and 3 in height with some space left on the top.

Optiplex PSU:
8L x 2.5W x 3H

Dimensions of the other PSU's.

Athena Power:
7L x 2.5W x 3.4H

Solid Gear:
6.9L x 2.2W x 3.2H inches

SeaSonic:
7.3L x 2.5W x 3.4H

It seems that the Solid Gear has the most wiggle room. Should I just go with that one?

In the picture of the Opitplex interior, you can see that from where the notch begins you can go at least one inch without the top or length of any PSU hitting the optical drive. Since the Dell PSU is 8 inches in length, I think the Solid Gear PSU should fit in just fine being just 6.9 inches in length and also smaller in other dimensions than the Dell PSU. Perhaps the Athena might fight in as well. Recommendations?

I've personally never heard of Solid Gear, and looking at their other units they don't seem overly impressive, though if you're not planning on stressing it then it should work, why do you need to upgrade?

 

[tobin48]

I've personally never heard of Solid Gear, and looking at their other units they don't seem overly impressive, though if you're not planning on stressing it then it should work, why do you need to upgrade?

I've bought a Low Profile XFX R7 250 Card and many users on Toms told me that if I won't be using it for heavy gaming and such 350w-400w should be perfectly find. Do you think instead of the Solid Gear I should just fit the Athena in there? It seems only to be slightly bigger.

 

[Dylzan]

It doesn't look like it has enough amps on the 12v rail to support an R7 250, as it has 16a on 2 rails whereas the XFX R7 250 requires 18a, with the Seasonic being the only one able to support that (just).

 

[ko888]

SeaSonic SS-300TGW 300W
maximum combined +12 Volt continuous current rating of 25 Amps
Dimensions: 6.9" x 3.3" x 2.5"

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151113

or

SeaSonic SS-300TFX Bronze 300W
maximum combined +12 Volt continuous current rating of 21 Amps
Dimensions: 6.9" x 3.3" x 2.8"

http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2054897.m570.l1313.TR0.TRC0.H0.XSS-300TFX.TRS0&_nkw=SS-300TFX&_sacat=0

 

[tobin48]

The SeaSonic is sadly to big, the psu slot in the dell is very tight. I however recently found a FPS Flex ATX. This one physically fits but would it be compatible to the R7 250?

FPS300-60LG-5K
http://m.newegg.com/Product/index?itemnumber=N82E16817104145

 

[ko888]

The SeaSonic is sadly to big, the psu slot in the dell is very tight. I however recently found a FPS Flex ATX. This one physically fits but would it be compatible to the R7 250?

FPS300-60LG-5K
http://m.newegg.com/Product/index?itemnumber=N82E16817104145

The screw mounting holes won't line up with the ones on the computer case.

What is the depth measurement as indicated in the following picture?

 

[tobin48]

The depth is about 6 inches. But the whole CPU will be sitting flat just like in the picture, will it be fine leaving it only partially screwed to one of the holes, with the rest of the PSU unscrewed. I will not be moving the conputer from this position at all. The depth on the FPS 300w is 5.9inches.

 

[ko888]

The depth is about 6 inches. But the whole CPU will be sitting flat just like in the picture, will it be fine leaving it only partially screwed to one of the holes, with the rest of the PSU unscrewed. I will not be moving the conputer from this position at all. The depth on the FPS 300w is 5.9inches.

The original PSU, in the Dell Optiplex 780 SFF, is a custom/modified TFX form factor PSU. Based on the picture a TFX PSU with a depth/length of up to 7 inches should just fit perfectly.

The SeaSonic SS-300TFX Bronze 300W is 6.9 inches.

 

[tobin48]

The original PSU, in the Dell Optiplex 780 SFF, is a custom/modified TFX form factor PSU. Based on the picture a TFX PSU with a depth/length of up to 7 inches should just fit perfectly.

The SeaSonic SS-300TFX Bronze 300W is 6.9 inches.

The depth on the SeaSonic is fine to fit but the problem is the width. The original Dell PSU has a width of about 2.37 inches (I had to do a remeasure) Actual Measurements are: 2.375 inches wide x 3.125 inches tall x 8.25 inches deep, anything over this won't fit because right where the width ends there are little metal grooves that stick up. These grooves seem to be built into the base to support the motherboard and create a space between the psu and motherboard. You can't see the grooves in the picture, I actually had to open up the Opitplex 280 to see them. I found that Athena makes a 500w Flex and Seasonic makes a 350w. Are any of these good choices?

Athena Makes A 500w Flex ATX:
http://athenapower.com/product/power-supply/flex-atx/ap-mfatx50p8

SeaSonic Makes a 350w Flex ATX:
http://www.seasonic.com/product/ipc_mini%201u.jsp

Pictured is the FSP 300w Flex ATX