Overclocking a Used Processor

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Dagoliroberto

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Feb 9, 2013
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So guys, I'm getting a 1 year old i5 2500k processor. The previous owner has never overclocked it because he has a h67 motherboard. I have a proper z68 motherboard and a Corsair A70, so I'm planning to overclock it to 4.5GHz at least. However, I'll only do that in December, when I get myself a GTX 780 (I currently have a GTX 570, so the stock i5 will not bottleneck for sure). By then the processor will have ran 1 year and a half on stock, and my question is: will that make it a weaker overclocker? I heard that the processor "gets used" to the voltage it ran at for a long time, is that true? In this case, is it better if I just overclock it right now instead of waiting for the 780?
 
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mapesdhs
To match a stock non-K 4570? Probaby not by much. Most people in forum discussions
tend to talk about this in terms of how a 2500K compares to oc'ing the newer K parts, ie.
the 4570K in this instance. Thus, someone might say, "a 2500K running at 4.8 is about
the same as a 4570K running at 4.3, but the 4570K runs hotter, needs better cooling,
etc.", that sort of thing (note that's just an example, not exact numbers). However, if
you're comparing to a stock locked 4570, I doubt a 2500K would need to be oc'd that
much at all to leave a 4570 far behind. People will often debate what the max possible
oc is for a 2500K, but in your case I should imagine even the minimum you could
expect from a 2500K would be quicker than a stock 4570, eg...
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mapesdhs

mapesdhs

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Up to you, but I doubt it would really make a difference. If you're concerned though, what you could
do is work out a suitable overclock profile now, keep it stored, run the system at stock most of the
time, but let it crunch through some stuff using the oc profile every now and then, once a week or
something. Plus, if you sort out what oc is possible now, that'll be one less thing to worry about
when you get your 780, since by that time I'm sure you'll be more interested in pushing the 780.
Either way, just make sure you have a good PSU.

I bought a used 2500K recently; with a used TRUE cooler on a used Z68 board, it only took three
minutes to get 4.7GHz stable. 4.5 is on the low side for a 2500K. I've no doubt the setup I built
will do 5.0 once I have the time to sort out the voltages & settings properly. Note it helps to have
RAM that can run at a decent speed aswell, just makes it easier. I bought a GSkill 2x4GB 2133 kit.

Ian.

 
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Dagoliroberto

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Feb 9, 2013
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I've got a TX650M. That should be able to handle the 780 and the OCed 2500K right?
 
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mapesdhs

mapesdhs

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Probably ok for one 780 (despite that model being a tad short on connectors IMO), though
personally I go for 750W minimum with all of my builds. Mind you, I've mostly bought used
PSUs (Thermaltake Toughpower), so I can't complain. :D To be certain, check the 780 tech
specs and compare against your PSU, make sure the 12V rail can provide the required current.

However, if you find that what ought to be an easy CPU oc isn't stable, it could well be the PSU.
Having a good quality PSU is essential in order to provide the board with stable voltages, etc.
Sort out the CPU oc first, see if you can get a good speed stable. If so, that's a sign the PSU is
adequate. If you're concerned about the power consumption headroom, buy a power meter
and see how much power the system is using when the oc CPU is under load.

Or between now & buying your 780, get hold of a used Thermaltake Toughpower 850W or 1kW
modular. :D Cheapest 1kW I obtained only cost the equivalent of $90. I have a used 750W
driving my 2500K (the mbd is a Gigabyte GA-Z68XP-UD4).

If you're sure your 650W is ok though, and you don't intend to add a 2nd card in the future,
then yes your exsiting PSU should be ok.

Ian.

 
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Dagoliroberto

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SLI is really not my thing, I'd only try it if I managed to find two 660 ti's for cheap, but no luck so far hahah
How much would I have to overclock the i5 2500k in order to match the 4570's performance? (not 4670k, i really mean 4570, the locked multiplier one), because I could also get myself one of those
 
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mapesdhs

mapesdhs

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To match a stock non-K 4570? Probaby not by much. Most people in forum discussions
tend to talk about this in terms of how a 2500K compares to oc'ing the newer K parts, ie.
the 4570K in this instance. Thus, someone might say, "a 2500K running at 4.8 is about
the same as a 4570K running at 4.3, but the 4570K runs hotter, needs better cooling,
etc.", that sort of thing (note that's just an example, not exact numbers). However, if
you're comparing to a stock locked 4570, I doubt a 2500K would need to be oc'd that
much at all to leave a 4570 far behind. People will often debate what the max possible
oc is for a 2500K, but in your case I should imagine even the minimum you could
expect from a 2500K would be quicker than a stock 4570, eg. 4.2GHz or so, but TBH,
if I was a 2500K (so to speak) and someone only oc'd me to 4.2, I'd be insulted, reach
out of the mbd & hit them with a fish. :D 2500Ks are just born to live in a 4500+ world. 8)

Another common discussion topic is how much one can oc a CPU without having
to increase the default core voltage, as that means no change in power consumption
and of course is the safest (if somewhat boring) form of oc'ing. You could try this first
if you want to play safe to begin with, get used to the whole process.

Have a look on overclock.net, it has numerous guides and disucssion threads
with relevant info.

Ian.

 
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