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There's really not so much of a difference:

http://cpuboss.com/cpus/Intel-Xeon-W3690-vs-Intel-Xeon-W3680

I doubt you would even notice that difference in real world operations. Do you already have a pci ssd, maximum ram and a current gpu? These would offer more value for money in terms of upgrades.

Yes I have Velo x2 with Samsung 830, 28GB RAM (i want to add more but not right now, it is at 1066 though not 1333 like it should be) and a 780GTX.

Should I just run this system to the ground and let it be?

You want to buy new cpu's for just a 133mhz increase?

You will not be able to feel any improvement on that setup.

Makes sense...but 133Mhz x 12 no? Not bad....I can sell the x5680 ...but too lazy to install these new CPUs.
 
Sounds like a pretty awesome Mac Pro that has some more productive years ahead! :)

It's super duper fast, almost 30,000 on benchmark multi-core score. The PSU did go out, though, and I replaced it, was pretty painless...I just didn't want to spend any money on it though...I think it's even faster than nMP base or mid level.

I just wish I got the x5690 and maxed it out :(
But I got a good deal on the x5680 before the x5690s prices dropped.
 
It's super duper fast, almost 30,000 on benchmark multi-core score. The PSU did go out, though, and I replaced it, was pretty painless...I just didn't want to spend any money on it though...I think it's even faster than nMP base or mid level.

I just wish I got the x5690 and maxed it out :(
But I got a good deal on the x5680 before the x5690s prices dropped.

FWIW I went with the 5690's mainly because I could get them locally, and couldn't find a local source of 5680's. I do have 1333 ram and am getting 27187 in geekbench3 in 32 bit mode (the free version).

On the stock 4 core 2.4's I was getting 13449.
 
My personal experience:

I went from 3.33MHz to 3.46MHz - 8 core.

W5590 to X5677. I know my newer CPUs are a later generation with more cache. But I felt the difference and my Geekbench scores increased.

Lou
 

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