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Welch
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i5-2500K Overclocking Paraphernalia

Tue Mar 14, 2017 9:50 pm

So I'm at the point where my small auto OC isn't quite cutting it. In light of the new Ryzen processors and what feels like an inevitable onslaught of 6-8 core goodness that Intel will have to eventually respond with, I felt it a good time to squeeze my i5-2500 for all it is worth.

However, dropping large sums on overclocking items that would die with this 5+ year old CPU would be silly. Instead I'd like to choose the best bang for the buck coolers that will also support the influx of AM4 chips.

My goal, to hit 4.6-4.8ghz stable while keeping the temps South (or North for temperament) of 75*C. I'm sporting the P67 Sabertooth (B3 of course), which appears to historically be an excellent overclocking board. Any CPU HSF would also be used with a Ryzen setup sometime in this year. Trying to stay sub $50 unless a particular unit is worthy of say... An additional $30 or so.

Any advice from previous experience?
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f0d
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Re: i5-2500K Overclocking Paraphernalia

Tue Mar 14, 2017 10:14 pm

what cooling do you have currently?

could always give this a go
https://www.newegg.com/Product/Product.aspx?Item=13C-000X-00037
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HorseIicious
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Re: i5-2500K Overclocking Paraphernalia

Tue Mar 14, 2017 11:06 pm

f0d wrote:
what cooling do you have currently?

could always give this a go
https://www.newegg.com/Product/Product.aspx?Item=13C-000X-00037


I've used that exact cooler on my 2500k for 6 years. I consistently ran my CPU at 4.6 to 4.7 at ~1.4vcore until I started to have some stability issues about a year ago. I think it was probably related to my memory (ended up swapping out some 1.35 for 1.5v memory which actually increased stability) - but I also backed down to 4.2 at that time and haven't tried going back up again since I use my PC as a workstation and really need very reliable stability. Figured at that high vcore over the years I probably damaged the chip some, so after getting stable again I was satisfied just to keep it above 4.0. I'm on an Asrock Extreme4 p67 for reference.

Edit: Running at the 4.6+ speeds, IIRC, idles were at around 30-35c; typical cpu intensive workloads were around 55-60c, and stress testing with Prime95, IBT, et al would go 70-78c
 
TwistedKestrel
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Re: i5-2500K Overclocking Paraphernalia

Wed Mar 15, 2017 12:39 pm

I am also using the ubiquitous Hyper 212 EVO, running a 2500K @ 4.4 and see temps just below 60 under reasonable load (using something like p95 pushes it a bit past 60). Coolermaster offers or will offer an AM4 retrofit for it. I would only go for the 212 if you can get it cheap, though - I definitely wouldn't cough up $50 for it. If it has a fault, I would say it's the fan - it had a lifespan of 2-3 years for me. A more modern alternative would be the Cyrorig H7, I would actually look at this first.

Also, 4.6-4.8 is not guaranteed on Sandy Bridge. Mine is rock solid at 4.4, but if I push it just 100 mHz further things get very messy. Maybe I could get it to work if I dialed enough voltage into it, but it would be way beyond the point at which I would be comfortable. It might go into semi-retirement soon anyway, waiting for Ryzen R5 to see.
 
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Re: i5-2500K Overclocking Paraphernalia

Wed Mar 15, 2017 12:41 pm

For the price of that 212X above, you could even get the Cyrorig H5
 
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Re: i5-2500K Overclocking Paraphernalia

Wed Mar 15, 2017 1:00 pm

Practically any 120mm tower heatsink will be enough to get you into decent OC territory, you just won't be able to push the voltage as high, so that last 100-200MHz require an expensive cooler.
On the P67 (I didn't have the Sabertooth, I was running the P8-P67M B3) it was trivial to overclock the 2500K:

  1. Leave the voltage alone and change the turbo multiplier to 40 (good starting point)
  2. If it boots to windows, restart it and increment the multiplier by one.
  3. At some point it'll crash booting windows - at stock voltage that is usually somewhere between 4.2 and 4.6GHz.
  4. Leave the multiplier where it was but add 50mV to the vCore and see if that boots. If not, drop the multiplier by one.

The aim is to see how far you can push it at stock voltage and if it's on the verge of being stable at any given speed, a minor voltage bump to ~1.25V should be enough to keep it stable without pushing the power requirements up too far. 1.35V is the realistic limit of air cooling and 1.4V+ is definitely either deafening or into watercooling territory. I've seen a 2500K that couldn't hit 4.2 on stock, and I've owned a 2500K that could hit 4.7 on stock. The key to low temperatures is to keep the voltage in check. 75mV is about all you want to add otherwise your temps will skyrocket quickly. It's an exponential power consumption curve as you increase the voltage!

Cryorig, Noctua, Coolermaster - anything 4+ heatpipes, 120mm+ and decent manufacturing quality should be able to dissipate 125W or so, and that's what you'd expect from a 1.25V clock in the 4.6-4.8 range if your chip can get there. Whether it gets there is just luck of the draw though and if you want to go that high there's a chance that will be from a leaky chip sucking down 1.4V or more - which is watercooling territory I'm afraid since you're looking at 165W or so (I'm estimating the power consumption of a 4.7@1.4V based on 95W at stock).
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Re: i5-2500K Overclocking Paraphernalia

Thu Mar 16, 2017 10:29 am

Don't worry about temps - if it's not throttling, you won't break it. I ran one of my 2600K's at 4.7 GHz with meh cooling that put it into the 90s fairly consistently. It's still functioning, and it was a launch-day processor. :)
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Re: i5-2500K Overclocking Paraphernalia

Thu Mar 16, 2017 11:00 am

If you're sticking ot air cooling, get a Cooler Master Hyper T4. CM says it comes ready for AM4 (so I'm guessing it uses the mounting tabs on the board instead of the holes) and should move to the new system easily. Bonus is that it performs well.
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Welch
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Re: i5-2500K Overclocking Paraphernalia

Thu Mar 16, 2017 5:25 pm

Yeah, just using the Stock HSF that came with the 2500k.

I've played around with the 212 EVO on another build. IIRC it was the one that scared the hell out of me since it didn't come with the un-mentioned rubber standoffs and ended up scratching the motherboard close to some traces when barely being tightened down. The board took longer than expected to post and had me sweating bullets for a bit. Luckily it didn't damage anything, other than the coating on top that it scratched pretty badly. Was such a PITA to installed and I swore it off forever.

I'd stick to air cooling for price I believe. The reading I did within the last year suggested that the CLC solutions like the Corsair H series are very good, but provide minimal difference compared to the much larger jump in price. If the H100/H110i was priced a little cheaper I'd probably consider one of those.

Again, I'd plan on probably moving this cooler over to a Ryzen build. Unless the fan was cheap like $30 and I could hit a good 4.6 steady, then I'd keep it on there and maintain the OC as a spare gaming rig assuming it's still alive by the time I replace it.

UPDATED: Well, surprise surprise. I forgot that I had already OC'ed this about a year or so ago. I'm currently sitting on a very modest 103 BCLK and multiplier of 42. So I'm sitting in the ballpark of 4.3ghz. A whoopin 1ghz OC. This was done manually, no voltage increase and the RAM is 1600 stock, so it is currently running at a tad over 1600. The machine has been so stable that I didn't even think to look. Man it's been too long.
"I think there is a world market for maybe five computers."
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i5-2500K|Asus P67 Sabertooth|16GB Corsair 1600|MSI 7850 2GB|500gb 840 EVO|Corsair 400R|ET750w PSU|Corsair M95 / K90 / Vengeance 1300
 
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Re: i5-2500K Overclocking Paraphernalia

Sat Mar 18, 2017 8:43 am

4.2 stock voltage at the moment?

Put the BCLK back to 100, put the voltage at 1.35 and see what it will POST at then.

If you can POST at 4.5+ then it's probably worth buying a new cooler. If it doesn't like those frequencies regardless of the voltage bump then there's no point - leave it how it is and save for a new platform.
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