CPU decision for GTX 970 SLI gaming at 1440P (i7-920, i7-3770k or i5-6600k)

drozd81

Distinguished
Jun 10, 2009
11
0
18,520
Facing a dilemma here with the decision how to upgrade my gaming rig. I already have the following components:

1366 Platform:
i7-920 D0 installed in ASUS P6X58D Premium - supports 3x SLI
Performance CPU cooler
3x of 2GB of DDR3 1600Mhz

1155 Platform:
i7-3770k installed in MSI Z68MA-ED55 (B3) - no SLI support due to second PCIe slot at x4 speed.
Performance CPU cooler CORSAIR H80
2x of 4GB of ram at 1333Mhz
Samsung 256GB SSD boot/game drive (EVO I think)

Have a Corsair 1000W power supply with 6x 12V feeds enough to support 3x SLI
HAF932 computer case

Already have 2x PNY GTX 970 XLR8 v2
Already have 1x EVGA GTX 970 Superclocked
Already have G-Sync 1440P monitor

Objective is pretty clear: I want to spend money efficiently and get the best bang for the buck to utilize most of my graphics power.

Here's the options I'm considering:

1. Build a system based on old X58 platform with i7-920 overclocked to 4Ghz. Use either 2x or 3x SLI. Sell the third GTX 970 to recoup the cost if not used. Sell of all my 1155 parts on ebay to recoup the cost.

2. Build a system based on old X58 platform but buy a used 32nm 6-core Xeon X56xx on ebay for about $60-90 and overclocked it as high as it would go (4.4Ghz or higher maybe). Use either 2x or 3x SLI. Sell the third GTX 970 if not used and all my 1155 parts.

3. Buy a used 1155 motherboard that supports SLI and build a system with 2x GTX 970. Sell the third GTX 970 and all my 1366 parts.

4. Sell the 1366 and 1155 parts and build a brand new i5-6600k CPU/MoBo base with either 2x or 3x SLI. Sell the third GTX 970 to recoup the cost if not used. Sell of all my 1366/1155 parts.

The parts I already have are pretty good, I like them as everything works properly and overclocks really well. I don't feel the need for a new platform. I'm tempted to buy an old hexacore Xeon and take my X58 parts out of retirement, if this works out, selling my 920 cpu would mean only $30-60 total cost of upgrade before selling anything else. Also, buying a used 1155 motherboard for about $120 on ebay for i7-3770k is tempting, since this cpu is newer and has been pretty darn good so far.

All I do is game on this computer. I play all kinds of stuff so I'm aiming for best performance at 1440p on average, not in specific titles. It seems like everyone keeps recommending the newer platforms for upgrades, but I'm not convinced i5-6600k or i7-6700k will be THAT much better at 1440p and quality settings dialed up. The graphics cards will be doing all of the heavy lifting at that point anyways. I see that many people report the minimum frame rates improve somewhat with the newer CPU's on top of a small average FPS increase, but I have G-Sync display to smooth them out.

So, what is the best thing to do here? Is it really going to be THAT much better with the current gen CPU? If you know of a benchmark that compares first gen CPU to current generation at 1440P with GTX 970 or 980 2x or 3x SLI, that would be awesome!
 
Solution
I ended up selling all of my X58 hardware due to the GTX 1000 series release. I sold all of my GTX 970's and bought a single GTX 1070 to go with my i7-3770k.
"3. Buy a used 1155 motherboard that supports SLI and build a system with 2x GTX 970. Sell the third GTX 970 and all my 1366 parts."

I think this would be best. Get a good Z motherboard for the i7-3770K, overclock the i7 to the moon, and do SLI.

I could also suggest selling all of GTX 970's and just get a single GTX 980 Ti (could sell only two of the 970's and have a single 970 until Pascal is released to get a high end card).
 

drozd81

Distinguished
Jun 10, 2009
11
0
18,520


The 980Ti solutions sounds like a good option as well. I can try to sell my 970's for a decent price to see if I can pick one up. I just bought me a Xeon X5670 for $80 shipped. I figured I can always sell it for $60-70 again if I need to get rid of it, so the risk is really low. So I have all my stuff listed for sale in the meantime, will see what goes first.
 

drozd81

Distinguished
Jun 10, 2009
11
0
18,520
Looking at the comparison of i7-990X and i7-5960X on Anandtech:

http://www.anandtech.com/bench/product/444?vs=1317

If you make an assumption that on OC'd X5670 will perform similarly to an OC'd i7-990X, then there isn't really a big difference vs i7-5960X in games with GTX770 SLI. Average and minimum frame rates are similar @ 1080P and the gap will close a lot more at 1440P where I will be playing. So far, the Xeon path looks very promising.
 

drozd81

Distinguished
Jun 10, 2009
11
0
18,520
This guy went from an X58 system with I7 920 @ 3.8, GTX 970 SLI
http://www.3dmark.com/fs/4966817
Physics Score 9166
Physics Test 29.1 fps

To an X58 system with Xeon X5670 @ 4.2, GTX 970 SLI
http://www.3dmark.com/fs/5245252
Physics Score 13864
Physics Test 44.01 fps

However, the Xeon config also had the graphics cards clocked 150Mhz higher on the core, so it is not a direct comparison. Still, the results are very nice and I doubt they come strictly from GPU adjustments.
 

drozd81

Distinguished
Jun 10, 2009
11
0
18,520
I ended up selling all of my X58 hardware due to the GTX 1000 series release. I sold all of my GTX 970's and bought a single GTX 1070 to go with my i7-3770k.
 
Solution