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Question on i5 cpus


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Initial post: Jan 8, 2013 10:59:10 AM PST
Just putting together an itx build and coming across energy cost (just for giggles) vs power vs actual item cost and was really wondering; is their a significant difference in going with an i5 thats oc'd "K" vs something that's not? Just using it for 1 game at a time via 1080p. Also I am sure a i5K runs extremely warm in tight places vs a regular non-oc'd i5...

Thoughts?

In reply to an earlier post on Jan 8, 2013 11:01:15 AM PST
Last edited by the author on Jan 8, 2013 11:01:51 AM PST
Well it should only run hotter if you are in fact overclocking it, and that really shouldn't come as a surprise.

EDIT: the K doesn't actually mean it's overclocked, just that it's unlocKed so OCing is an option.

Posted on Jan 8, 2013 11:03:02 AM PST
Last edited by the author on Jan 8, 2013 11:04:18 AM PST
I would recommend the K option if you are even remotely interested in OCing in the future. Most decent Asus or MSI boards come with auto overclocking utilities that are a simple as pressing a button and gaining around 10-15% performance-wise.

My buddy did this with his i5 (k version), on the auto clock it went from 3.7 - 4.1 with zero stability issues. Very handy if you don't feel like delving into tweaking the wattage/fsb/multiplier settings.

In reply to an earlier post on Jan 8, 2013 11:03:41 AM PST
Last edited by the author on Jan 8, 2013 11:04:30 AM PST
"EDIT: the K doesn't actually mean it's overclocked, just that it's unlocKed so OCing is an option."

Is this true? I feel so stupid if this is in fact true........I know why I almost depleted my FX4100 if Mogwai spits truth. (I thought unlocked 'K' things came factory oc'd?)

In reply to an earlier post on Jan 8, 2013 11:05:35 AM PST
Last edited by the author on Jan 8, 2013 11:06:25 AM PST
That's true.

Even the non-k version can be OC'd to some extent...The multiplier is locked but you should still be able to tweak the FSB settings as well as other things.

You won't have very much headroom though without the K version.

Posted on Jan 8, 2013 11:07:01 AM PST
Lyrick_ says:
for smaller builds that concern power and thremo issues you're probably going to want to look at 'S' and 'T' versions of intel core processors. They only consume 35W or 65W (i3 vs i5)

unlocked 'K' versions allow for overclocking over/undervolting and other fun stuff that can maximize computational power vs price.

Normal (unlettered) versions are locked down with fixed frequencies or multipliers

In reply to an earlier post on Jan 8, 2013 11:07:15 AM PST
Which I learned after doing that with my FX4100. All is good with my current build, I learned a lot by trial in error stuff.

Lol, man, I almost wasted big money when I did that. Oh well, it's all good now.

In reply to an earlier post on Jan 8, 2013 11:07:45 AM PST
Good info, this is exactly what I wanted to know. Thanks Lyrick.

Posted on Jan 8, 2013 11:09:42 AM PST
Last edited by the author on Jan 8, 2013 11:11:23 AM PST
A stock "K" shouldn't run any hotter than a locked CPU. But there would be no reason to get a "K" if you aren't overclocking it at all. As far as I know, the only real difference is the unlocked multiplier on the "K." Since everything is tightly connected these days, multiplier-based overclocking is the only way to get any real gains. You can bump clocks a bit, but the system will become unstable before you get anything out of it without using a multiplier.

In reply to an earlier post on Jan 8, 2013 11:11:21 AM PST
Last edited by the author on Jan 8, 2013 11:11:55 AM PST
Haha, yeah...It took me around a full day tweaking settings to get my FX-8150 stable at 4.6. This thing is a power hungry SOB though.

Posted on Jan 8, 2013 11:12:23 AM PST
Well here's my next question, if 'S' and 'T' models of the i5 run at lower wattages; why are they pretty much the same price? Wouldn't those model hinder performance compared to a regular locked i5 3750?

In reply to an earlier post on Jan 8, 2013 11:13:25 AM PST
Last edited by the author on Jan 8, 2013 11:13:38 AM PST
It took me that long as well. I got mine running at 4.0 (actually 3.9xxxx) and I am not going any further due to me, 1) not really needing it, and 2) don't want to blow up anything. 4.0 is good enough for a FX4100. The max I think is 4.2..

In reply to an earlier post on Jan 8, 2013 11:17:07 AM PST
Lower stock available? Niche products cost more than standard?

I don't actually know but those are my first two guesses.

In reply to an earlier post on Jan 8, 2013 11:17:56 AM PST
Lyrick_ says:
no prob, heads up though, Intel will be debuting a new architecture (Haswell) this year with new socket types. I read a reddit AMA with a intel Engineer a week or two ago that was sdvertising if you were impressed by the overclocking of the 2500K the upcoming 4670K will be right up your alley.

Also note that during this new cycle (Intel's Tick) they will be debuting a large quantity of low powered 'S' and 'T' chips ranging again from 35W to 65W.

In reply to an earlier post on Jan 8, 2013 11:17:58 AM PST
Probably Niche products cost more than a much readily available product. I haven't heard much on the S and T versions, but the more popular ones are obviously the K and locked version.

In reply to an earlier post on Jan 8, 2013 11:19:30 AM PST
Last edited by the author on Jan 8, 2013 11:24:35 AM PST
Cool. Won't be doing anything any time soon. Just doing my research and planning for a side project for me to work on.

Does the S and T version hinder great performance? Or should they be pretty darn close to it's closed counterpart? The i5 3570k only uses 77W... While these versions use 65W...is a 11W difference truly a big thing? Now 125W obviously is.

Got a nephew-in-law(?) that's interested in PC building but is young and parents don't want to spend money. Might sell him my current one for cheap.

In reply to an earlier post on Jan 8, 2013 11:19:34 AM PST
That and they push the "green" factor, probably.

In reply to an earlier post on Jan 8, 2013 11:25:56 AM PST
Lyrick_ says:
They are not quite as powerful as the normal variants and there is no Ivy Bridge versions of them (Ivy Bridge was the Tock [second] cycle), they are for low power and low thermal solutions like very small HTPC implementations or all in one devices.

In reply to an earlier post on Jan 8, 2013 11:34:47 AM PST
Lyrick_ says:
Tom's just did a comparison of all active socket CPUs at the end of last year.

Beware Lots and lots of charts...

http://www.tomshardware.com/reviews/cpu-performance-comparison,3370-17.html

Pulling random numbers for comparison:

Peak (test system) power consumption:
i5 2500T - 92W
i5 2400S - 95W
i5 2500K - 122W
i5 3570K - 119W

PCMark 7 Suite:
i5 2500T - 4124
i5 2400S - 4157
i5 2500K - 4606
i5 3570K - 4975

Gaming w/ a 7870 (Crysis 2 720p on low)
i5 2500T - 106.9 fps
i5 2400S - 110.3 fps
i5 2500K - 118.3 fps
i5 3570K - 121.0 fps

In reply to an earlier post on Jan 8, 2013 11:35:24 AM PST
Last edited by the author on Jan 8, 2013 11:36:18 AM PST
I wonder, the Cooler Master 120 case (itx) can fit a full sized gpu and full sized psu... I wonder if it really doesn't matter, I can fit a 600-700w psu in there; I probably don't need to worry about S and T models.

"Gaming w/ a 7870 (Crysis 2 720p on low)
i5 2500T - 106.9 fps
i5 2400S - 110.3 fps
i5 2500K - 118.3 fps
i5 3570K - 121.0 fps "

Interesting, thanks for the post.

Posted on Jan 8, 2013 11:37:33 AM PST
MrFoxhound says:
What are you going to do with your FX 4100?

In reply to an earlier post on Jan 8, 2013 11:38:19 AM PST
Keeping it for awhile, just doing some research and asking questions.

In reply to an earlier post on Jan 8, 2013 11:42:32 AM PST
MrFoxhound says:
You should build another one. It's tax time after all. Maybe someone on the VGF could take your 4100 off your hands for a modest price.

In reply to an earlier post on Jan 8, 2013 11:43:15 AM PST
Last edited by the author on Jan 8, 2013 11:44:00 AM PST
Lyrick_ says:
I found a review that say's it can accommodate a maximum graphics card length of 343mm. That's big enough to fit just about anything.

This guy crammed a ocz modx 600 and a GTX670 into his

http://xyexz.files.wordpress.com/2012/08/wp_000299.jpg
http://xyexz.files.wordpress.com/2012/08/wp_000294.jpg

Posted on Jan 8, 2013 11:43:33 AM PST
Good to see my x6 1090T aging well. It didn't perform too horribly compared to some of the i5s and beat out many of the FX chips. If that's the case I might just hang onto it a bit longer and only upgrade my GPU next year instead of a CPU overhaul as well.
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This discussion

Discussion in:  Video Games forum
Participants:  11
Total posts:  44
Initial post:  Jan 8, 2013
Latest post:  Jan 8, 2013

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