Intel Core i7-875K and i5-655K Unlocked - HotHardware

Intel Core i7-875K and i5-655K Unlocked

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Aside from their markings, there isn't anything that physically differentiates the new Core i7-875K and Core i5-655K from other Lynnfield and Clarkdale based processors.




The Intel Core i7 875K (left) and Core i5 665K (right) Side-By-Side -- From The Top and Bottom

As you can see in the images above, the Core i7-875K and Core i5-655K use the same LGA1156 packaging, but the surface mounted components on their undersides are different from each other.

 
Intel Core i5 655K and Core i7 875K CPU-Z Processor Details

Above are a couple of screen captures from the latest version of CPU-Z showing the Core i7-875K's and Core i5-655K's pertinent details. Looking back at our previous coverage of the first Lynnfield and Clarkdale chips to arrive in the lab, it appears that the Core i7-875K uses the same stepping and revision as previous Lynnfield-based Core i7 processors, but the Core i5-655K is based on a new stepping and revision of the Clarkdale chip (5 vs. 2).

Intel K-Series Unlocked Processors Overclocked
Pushing The Limits

 
Overclocked Intel K-Series Processors, CPU-Z Details

This next set of CPU-Z screenshots shows our max stable overclocks using the new Core i7-875K and Core i5-655K processors in an Asus P7H57D-V EVO motherboard, outfitted with a new BIOS that properly supports the chips. Other than their core speeds, what's important to note here is that all of the overclocking gains were achieved by simply increasing the processors' multipliers. By doing so, the CPU frequency is increased, but all of the other components that derive their clocks from the base clock frequency (incorrectly labeled Bus Speed by CPU-Z) are running perfectly within spec. With a good motherboard that has a BIOS specifically tailored for these new K-Series processors, users have complete control over CPU, Memory, and Turbo mode multipliers and can quickly and easily tweak any of their settings.


Core i7 875K Overclocked to 4GHz...


...And the Core i5 655K at 3.9GHz

To overclock the Core i7-875K and Core i5-655K, we first increased each processor's voltage by .15v and then increased their multiplier until our test system was no longer stable. Turbo mode was disabled to prevent any unwanted frequency spikes, but we left HyperThreading enabled. In the end, we hit 3.9GHz with the 655K and 4GHz with the 875K.

At those speeds, using a stock Intel cooler, the 655K idled at around 37'C and peaked at about 67'C under load. The 875K idled at around 44'C and peaked at about 72'C.

Just in case you're wondering how much additional performance was gained by the overclocks, the Core i5-665K had an MT score of 10,459 in the Cinebench R10 benchmark in its stock config, and an overclocked score of 12,126--and increase of almost 16%. The 875K had a stock score 18,659 in the same test, with an overclocked score of 22,361--and increase of about 19.8%. Of course, with overclocking, your mileage will likely vary.

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Now, someone is taking cues from competition? Wink Awesome! I would love to get my paws on the 875K sooner than later.

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Good to see Intel creating their own "Black Edition" if you will that is not priced at $1000.

These should sell well, as if Intel did not already own the performance crown in the CPU arena, this seals that debate!!!!!!!

Kudos Intel Yes

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Glad I've been patient with upgrading... the 875 loox very tasty indeed!

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recoveringknowitall:
the 875 loox very tasty indeed!

 

I agree with you,.....the 875K looks nice for the price. I could use one of these on my CyberPower-PC box and move the 870 in it over to replace the i5-750 in the other computer. $350.00 will upgrade both PC's nicely. I would have the i5-750 to sell off and recover some of the $350.00 I spend originally. This really sounds like a plan to me.

This is exactly why I like HotHardware so much, getting the heads-up on all of the newest tech gear is a real bonus.

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Value Core i7 with great power.

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Would love to get one of those under my waterblock and see what it does.

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Nice to see Intel copying AMD for a change. This is especially nice for budget users who want to buy a processor and overclock it so that it gets equivalent performance to one of the higher-performance processors. While I would like to go AMD due to the budget, I'd like to go Intel and get better performance for my new system build if I get the money to do it.

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Yeah, I like budget parts that perform well. The fact is that this one CPU will upgrade two PC's for me and that's nothing to sneeze at. The i7-870 I have already goes to the system with the i5-750 in it now and the i5 is sold. The new i7-875K goes into the CyberPower PC and gets the crap overclocked out of it.

Wheee!!

It's an elegant solution for not allot of money.

 

(i guess I already said this in a previous post) Whoops!

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Love the work Intel is doing!

Also, just to let you guys know, CyberPower is doing 2 giveaway/contest with the Intel 875K CPU! (Check their facebook page)

And just a guess but i think HH's next sweepstakes will be this CPU :P

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The i7 875K is priced right but the i5 655K pricing seems much too high.

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