[2019] Need help deciding to upgrade or not to Xeon x5690 (or 990x)

Dec 23, 2018
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I don't want to build a new gaming system just yet. I am planning to go for it in about 1-1,5y, when we hopefully get some better intel CPUs. Till then, I wouldn't say "No" to some overpriced extra CPU horsepower, as long as I am not totally wasting money, 'cause the games I am playing seem like they could benefit from some extra CPU power. I am using this PC for gaming at 1440p (2560x1600) and I am thinking about upgrading the CPU (if I decide that it's remotely worth it), spending about 250 euro max.

My current system consists of the following:
PSU - Corsair 1200W
Mobo - EVGA X58 Classified 3 (141-GT-E770) - LGA 1366
CPU - i7 950 @ 3.9 Ghz (23 x 167, 23 x 171 is fine too) - conservative o/c on air using a Prolimatech's Megahalems with 2 fans setup.
RAM - Corsair 1600 6 x 2gb = 12gb RAM (clocked at 1338 Mhz)
GPU - 2x GTX 780 Ti SLI
Storage - 2 SSDs, 2 HDDs, games run from EVO 960 on Sata2
Monitor - Dell u3014 (2560x1600)

I only have basic experience with o/c and I believe I could get more out of my 950, but back then when I had bought it, after experimenting with it for some time, I decided that I was happy with a conservative 3.9 ghz o/c that I could reach with stock voltage, because to go higher I had to increase voltage considerably, get considerably higher temps and it had seemed to me like it wasn't worth it in the long term, like I was gaining just a little extra (like 200-300Mhz) for considerable more long term heat and thus wear.

So, according to EVGA, the following CPUs are supported by my mobo:
a) up to Gulftown Core i7 990x - 3.46 GHz and
b) up to Westmere Xeon x5690 - 3.46 GHz.

According to ebay, I could get the 990x for roughly 200 Euro and the x5690 for 100 (both 2nd hand). So, I was wondering:
1) Say those 100 Euros are weighing my pocket and I wouldn't mind too much letting them go, would I be looking at a semi-decent upgrade of like 10-15% or so in gaming by grabbing the x5690? What kind of stable o/c do you think I would be able to get on air? Could I get much more by using some hybrid cooling solution? (I think not, about the last bit, right?).
2) If I decide to get the x5690, do you think that the extra 100 Euros to get a 990x would even remotely worth it? What extra would it be able to provide for gaming?

Finally, keep in mind that most of the games I am playing can't really utilize effectively more than 2 cores, definitely not more than 4. So, I am going by the assumption that I would see a real benefit only if I could get a considerably higher stable o/c frequency with a x5690 or 990x. Am I wrong to assume that, are there any substantial real life gains to be expected by the newer architecture of the x5690 or 990x in gaming? (newer compared to my i7 950).

Thanks in advance for any help.

EDIT: So it was brought to my attention that Xeon x5675 could be a valid choice as well, way cheaper and good for o/c. But EVGA isn't mentioning the x5675 as supported. The x5670 and x5667 are supported though. I am wondering if the lower TDP of the x5670 and 5667 (95W opposed to 130 for the x5690) would make for a better o/c on air. Additionally, considering that the x5667 has 4 cores and I don't think I need 6 for gaming, maybe between x5667 and x5670, the x5667 would be better for o/c due to having less cores? Thoughts?
 
The x5690 and 990x are basically the same chip. Xeon is the workstation variety. Both of these would be nearly a "side grade" to your overclocked 950 unless doing video edits or renders that use the extra cores gained.

The major factor is your monitor refresh. If playing at 60 hz, then sell your older gpus, replace with a gtx1070 and keep the 950 setup for a while longer.

If playing at 120hz, then a new mb / cpu / ram / gpu is likely needed for the system not to bottleneck at that high resolution / refresh rate.

Hope this helps - Happy Holidays