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INTEL Core 2 Extreme QX9775 3.2GHz vs i5 2500k?

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February 14, 2012 3:14:37 PM

Which is superior? I ask because I currently have a 771 chipset mobo and upgrading to an i5 2500k and getting a new mobo would be expensive.


My computer is as following:

Motherboard: ASUS Rampage Extreme
CPU: Intel "Kentsfield" 2 quad core Q6700 @ 2.66GHz
RAM: Corsair 4GB @ 1033MHz
Hard Disk: Raid1 Dual WD 1TB @ 7200RPM
Video Card: AMD Radeon HD 6970
All at factory values


Please give your opinions.
a b à CPUs
February 14, 2012 3:52:11 PM

The question is milage vs money.
.. Sure the QX975 will be a great boost to CPU power - BUT that's it - How long tell you find out your missing out on the other features.
.. Main reason I went from a I5-750 ->I5-2500k was NOT the CPU but because of the MB. Sata III for that future SSD, USB3 for faster external HDD and for USB3 thumbdrives. Pcie 3.0 (not needed today, or tomarrow - how about a year from now???
If you do any video encoding then you would be missing out on Quicksync (Requires SB CPU + Z68 MB.
Sure you can add a pcie card (maybe), but the sata III is 3rd party controler and not as good as Intel Sata III MB controller. Also # of devices limited by PCI-e lanes which may cap your new devices to sub-par performance.

If Gaming is your only use, then the Q975 will satisfy you for the near future, but a year from know, if you end up finding the other MB features compelling; then that $$$$ may not have been cost effective.
a b à CPUs
February 14, 2012 3:59:57 PM

Save up and move to a socket 1155 or better, throwing money into dead architecture is not wise.
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a b à CPUs
February 14, 2012 4:00:19 PM

The core i5 2500 is 1 tier above the QX9775.

http://www.tomshardware.com/reviews/cpu-gaming-performa...

If you can even find the QX9775 - it might be worth it depending on how expensive it is.

If anything - I would overclock your current CPU. Maybe get a better cooler. It's still a half decent system and would save you a whole new build until your ready.
a c 233 à CPUs
February 14, 2012 4:21:54 PM

The 2500K wins every single benchmark. Also assume an overclock limit of about 4Ghz for the Q9775 and 4.5Ghz for the 2500K giving the 2500K an even bigger advantage.

Also the Q9775 is Skulltrail only right? You mean a Q9770. Either way expensive and outdated.

http://www.anandtech.com/bench/Product/48?vs=288
February 14, 2012 4:24:28 PM

The 2500k can go up to 5+ ghz
a c 233 à CPUs
February 14, 2012 4:27:48 PM

seumas_beathan said:
The 2500k can go up to 5+ ghz



Not every chip overclocks the same. Also you can only run 5Ghz safely in most cases with a custom water loop. Too much voltage to run air.
February 14, 2012 4:29:45 PM

anort3 said:
Not every chip overclocks the same. Also you can only run 5Ghz safely in most cases with a custom water loop. Too much voltage to run air.



Didnt someone get one up to like 6.7 ghz with liquid nitrogen?
a c 233 à CPUs
February 14, 2012 4:31:52 PM

Is that a realistic day to day overclock? No.
February 14, 2012 4:35:56 PM

anort3 said:
Is that a realistic day to day overclock? No.


No need to be rude, i was just curious to see if i was right.
a b à CPUs
February 14, 2012 4:59:47 PM

Basically, you don't want to throw away money on an old system.

I would say get a coolermaster Hyper 212+ for your CPU and overclock it. It should help tide you over until you get a new system. Its around 40 bucks. Your 2.66Ghz should easily do 3.0Ghz or even a little more with a better cooler.
a c 190 à CPUs
February 14, 2012 6:04:56 PM

The change from the Intel® Core™ 2 Quad to the 1st generation Intel Core processor give a 15 to 20% performance improvement at the save clock speed. The change from the 1st generation Intel Core processors to the 2nd Intel Core processors of which the Intel Core i5-2500K is a member would have given an additional 10% to 15% performance increase at the same clock speed. In the end you would see something around a 30% total improvement in performance. Now understand this wouldnt all translate into a 30% performance increase in a game since most of the gaming performance is based off the video card. This also doesnt cover any overclocking.

Christian Wood
Intel Enthusiast Team

a c 158 à CPUs
February 14, 2012 7:39:07 PM

OC your current setup and you'll be fine for gaming and cost nothing. Sata 3 or usb 3 isn't going to help gaming and the q6700 is not holding back your gpu.
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