I've seen this thread which talks more about PSU requirements (which I think shouldn't be an issue because I've upgraded to the 500w PSU) and then gets more into the weeds about it being not worth the cost due to how much the performance is boosted, etc.

This thread mentions that the system 'appears' to not support 3rd generation CPUs but that's not exactly a confirmation. This forum definitely helped me avoid making an error with my RAM, I knew that the system could only take a specific kind of RAM and made my purchase accordingly, worked out great and I definitely wouldn't have known without the advice here.

I'm just wondering if there is any confirmed reports of what the 'best' CPU is that the system could take, so I can judge if it's worth the upgrade or not.

Thanks!

Doesn't make a blind bit of difference if an application is supported by the hardware manufacturer: 7-Zip is compatible with all versions of Windows since XP (at least) and many other operating systems. The point being that the application "talks to" the hardware through the OS rather than directly. If the application is supported by the OS and the OS is supported by the hardware, you're good to go.

You are right !!!!!!!!!!!!

I downloaded it (not from dell) and it really works. Thanks.

hey I want  to ask can I put a diff motherboard in the dell OptiPlex 990  MT case I have one but I need a better motherboard with getting a whole new case

I'm just wondering if there is any confirmed reports of what the 'the best CPU' is that the system could take, so I can judge if it's worth the upgrade or not.

Assuming you can track down a position of safety GTX 1050 Ti, it will fit. The main concern would be the force supply. Despite the fact that the GTX 1050 Ti doesn't need outside power from the force supply you need to check whether the PSU meets the necessities. However, there is some adaptability with that. I'm as of now testing an EVGA GTX 1050 Ti on a Dell Optiplex i5-2400 mid-tower. The PSU is underneath 300W yet I need to twofold check. So far the card runs fine in this framework.

These kinds of Dell frameworks do utilize some exclusive parts, basically the fan headers and front board headers. In any case all else is well similar to the PCI-E openings, PSU motherboard connectors, RAM spaces, SATA ports, and so on Motherboard size-wise I think they observe the ATX guideline, particularly the mid-towers frameworks. I'll need to check my father's frameworks since he has a few SFF PCs. In any case, from what I've looked it appears to be that the SFF frameworks utilize a similar kind of motherboard, just packed into a more modest space. The USFF frameworks might be utilizing something different.

For value, it's intense. Assuming you can get an i7-2600 framework with essentially 8GB, $125 is a fair arrangement however I figure you could possibly improve. Most certainly look towards a mid-tower for the space. The Optiplex cost me about $93 and here's the posting. (Transferring screen capture rather than eBay post per rules, my unique post was taken out) I was then ready to discover a Xeon E3-1275 v1 CPU for $78 on eBay which will supplant the i5-2400. This CPU is practically identical to the i7-2600 (non-K). On the off chance that I sell the i5-2400 for about $30-$40, complete expense of the framework will come out to about $130-ish before the GPU. This incorporates the 8GB of RAM and the 1TB of capacity. The GPU was bought from EVGA's B-stock for $119.

"I'm just wondering if there is any confirmed reports of what the 'best' CPU is that the system could take, so I can judge if it's worth the upgrade or not."

Top listed CPU in the Optiplex 990 Tech Guide is the I7-2600.