Dell Optiplex 790 compatible mid range GPU? specifically HD 6850?

[Pancake]

My PSU don't have any spare Molex connectors. Bad luck for me then

2 molex splitters should work, just take them off different cables to be on the safe side

Then you will have 2 spare

[ik9000]

Assuming the PSU is a single rail design... which for a Dell I imagine it would be. Though does the PSU have enough capacity on the 12V output to run the GPU in addition to everything else? What are the stated ampages for each rail on the PSU label (stuck to the side of the PSU usually)? Can you provide a photo?

[kazazink]

Thanks for the concern guys, but I just might sell my rig and build a custom rig with my own preferences.

[CAT-THE-FIFTH]

This document will be useful for the OP:

http://www.dell.com/downloads/global...tech-guide.pdf

It says the PSU is a 265W one. It has two 12V lines with 17A and 9A respectively.

An HD6670 GDDR5 would be the fastest bus powered card which will fit in the case.

I would also measure the physical dimensions of the PSU too. This looks like the PSU the OP has:

http://www.ebay.co.uk/itm/Dell-Optip...-/320756099488

Edit!!

This looks like the inside of the case:

https://www.skyrr.is/library/Images/...0090r_open.jpg

If it is the same case the OP has,it look like a bigger PSU will fit.

Once you know the length,they can get a more powerful PSU. The Core i3 2100 will be fine for gaming - I use with an HD5850 1GB.

[Pancake]

The dell ones are non standard though, so he would have to deal with it screwed in on an angle, still works fine though.

[kazazink]

If a new PSU will fit in my case I might consider that and put a 6770 or 6790. How sure are you sirs that a new PSU will fit in my case?

Edit:
Yes that's exactly my rig and the PSU also are the same with mine. Any thoughts?

Edit again: I've measured the PSU using a ruler. it's dimension is 5.4"X5.8"X3.3".

[CAT-THE-FIFTH]

If a new PSU will fit in my case I might consider that and put a 6770 or 6790. How sure are you sirs that a new PSU will fit in my case?

Edit:
Yes that's exactly my rig and the PSU also are the same with mine. Any thoughts?

Edit again: I've measured the PSU using a ruler. it's dimension is 5.4"X5.8"X3.3".

An HD6670 GDDR5 will work fine with your current PSU IMHO. Can you confirm that the last measurement of your PSU as 3.3" seems quite small.

The XFX Pro 450W and 550W are only 140MM long:

http://p.gzhls.at/622037.jpg

If you look at the screw holes of the Dell PSU they seem to be similar:

http://www.ebay.co.uk/itm/Dell-Optip...-/320756099488

[CAT-THE-FIFTH]

Does this look like the back of your existing case:

http://www.anandtech.com/Gallery/Album/1047

The PSU seems to be made by ACBel.

[Pancake]

They are much narrower, i can confirm this as i have seen a few in bits

[CAT-THE-FIFTH]

If the OP has the largest Dell 790 case it is a standard mATX size.



Looking at the fan and screw locations the size looks the same as an Antec EA380D.



Edit!!

Looking at the Dell PSU,it might be using a 70MM fan but now way it does not look 8CM wide. The mini-tower case is 17.5MM wide:

http://www.dell.com/us/business/p/optiplex-790/pd

An 8CM wide PSU would mean the OP has the desktop case.

[Pancake]

Yes, we found this out on the first page. Anyway, its NOT a standard PSU. but hey-ho whatever

[kazazink]

So i guess the best thing to do or the 100% solution is to buy a new case,PSU, and a video card? Im not really sure about if it has two PCIE slots(X16), if it does i have to insert the video card to the lower slot for more length space because the sata cables will block the upper slot. Am I right sirs?

Edit: -Yes I think it is 3.3 inches, the standard PSUs is 3.4 inches I think?
- Another yes, thats exactly what the back of my case looks like.

[CAT-THE-FIFTH]

So i guess the best thing to do or the 100% solution is to buy a new case,PSU, and a video card? Im not really sure about if it has two PCIE slots(X16), if it does i have to insert the video card to the lower slot for more length space because the sata cables will block the upper slot. Am I right sirs?

Edit: -Yes I think it is 3.3 inches, the standard PSUs is 3.4 inches I think?
- Another yes, thats exactly what the back of my case looks like.

So the length is 3.3" deep(height),5.4 across(width) and 5.8" long? Is it possible to the measurements in CM? I assume the measurements are done with the PSU still in the case?

I suspect a normal PSU should fit fine as the variation is size with your measurements is 2MM to 3MM.

The top slot is 16X and the bottom slot is 4X. Having said that either slot should be fine for speed with a card upto an HD5850 1GB.

However,I have found something which may scupper your upgrade plans. The Dell technical manual states the PCI-E slot is limited to only 35W. Now the only issue is whether the 35W limit is down to only having a 265W PSU or whether Dell has artifically limited the motherboard to 35W for its PCI-E slots. You will need to find out.

Normally the upper limit should be 75W and if Dell has limited the motherboard it could cause the slot to burn out.

Edit!!

It does seem rather strange that a 35W limit is mentioned, as Shuttle SFF PCs tend to have 250W and 300W PSUs and people run HD6670 and HD6770 cards fine with them.

[kazazink]

I think a powercolor HD 6790 will fit, it's just 8.5 inches according to their site. Hmmm, I think that will be the case if the card is power dependent to the mobo but if it draws power from the PSU itself like the powerful ones I think there will be no problem?

[CAT-THE-FIFTH]

I think a powercolor HD 6790 will fit, it's just 8.5 inches according to their site. Hmmm, I think that will be the case if the card is power dependent to the mobo but if it draws power from the PSU itself like the powerful ones I think there will be no problem?

The first 75W is drawn from the PCI-E slot and additional power from the six pin connector. Each six pin connector can provide 75W.

[kazazink]

So What's the best card that I can put in my mobo? For gaming.