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2500k and 3570k OC questions

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July 8, 2012 6:44:54 PM

I'm probably going to be building a gaming PC in the upcoming months, this will be my first build, and I want to find out about the overclocking abilities of the 3570k and the 2500k before buying a CPU. Here's the question:

For a ~4.5ghz OC, what kind of cooling would I need for the 2500k or the 3570k? I've heard that the 3570k cannot OC as well as the 2500k so for something around a 4.5ghz OC, would I need different cooling to what I'd use for the 2500k? I was thinking maybe a Hyper 212 EVO. Would this be OK?

Other components I'm planning on having:

- HD 7850
- 8GB RAM
- Gigabyte XKT-1155 Z68AP-D3 Motherboard http://www.amazon.co.uk/Gigabyte-XKT-1155-Z68AP-D3-Moth...

Would I be able to get a ~4.5ghz OC with the above motherboard?

Games I am planning on playing:

BF3, GTA 5, ARMA 2, ARMA 3 and other generally graphically intensive games maxed on 1920 x 1080.

More about : 2500k 3570k questions

a b à CPUs
a b K Overclocking
July 8, 2012 8:01:30 PM

If you can afford it I'd go for an Asus P67 or Z68 board.

The newer 22nm cpu's are generally a little bit quicker but don't oc quite as high and are as little warmer.

I was just making the same decision as you recently and went for a Sabertooth P67 with a 2600k.

I would say a P67 with 2500k is a pretty good combo and probably a bit cheaper.

Don't skimp on cooling, I went for the Corsair H100 and it'll keep my cpu at any temp I ask it too even @4.8ghz with 1.3v.

I hear the 212's are up to scratch on cooling power but you may want to buy some decent fans for it.

You will easily achieve a 4.5+ghz with any of the Asus P67/Z68 boards and I'm sure others will vouch for other brands, I just use Asus.

Awesome board http://www.ebay.co.uk/itm/Asus-P8P67-Deluxe-Socket-1155...
July 8, 2012 8:09:10 PM

Isn't the motherboard I mentioned a Z68 or am I missing something? Also, with a Z68, would a 3570k go to 4.5ghz?
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a b à CPUs
a b K Overclocking
July 8, 2012 8:14:49 PM

Yes I know, I was suggesting another option.

The Z68 board has official support for Ivybridge along with some other features you may never use.

All chips are different, I would think 4.5ghz is achievable but with what voltage/heat, who knows.

This is worth a read http://forums.anandtech.com/showthread.php?t=2208386
July 9, 2012 8:19:32 PM

Just wanted to add: I just finished my 3570K, and with a hyper 212 evo, I'm sitting @ 4400 without ever touching the Vcore or turbo voltage. So stock voltage 3570K, and I'm at 4.4.

The moment I go to 4.5, I get immediate BSOD, and need to add voltage. It also makes my ram a little unstable. I'll push it later, right now doing a 5 hour prime 95 run.
July 9, 2012 8:21:13 PM

99.9% of Ivy bridge chips have no issues hitting 4.6Ghz. After 4.6Ghz it starts getting alittle warm.

Any decent cooler with 4+ heatpipes will do
July 10, 2012 3:15:56 PM

Graphite946 said:
Just wanted to add: I just finished my 3570K, and with a hyper 212 evo, I'm sitting @ 4400 without ever touching the Vcore or turbo voltage. So stock voltage 3570K, and I'm at 4.4.

The moment I go to 4.5, I get immediate BSOD, and need to add voltage. It also makes my ram a little unstable. I'll push it later, right now doing a 5 hour prime 95 run.


I think a 4.4ghz OC with an IB (and a 212 evo which only costs ~£25) would be great for me. I don't want to go crazy with the overclocking (e.g. pushing a CPU to 5ghz). Also, I've heard that clock-for-clock, the IB is around 300mhz faster than the SB so would I be right in saying that a IB 3570k overclocked to 4.4ghz is around the same as a SB 2500k at 4.7ghz?

Another thing; do you know why the 100mhz increase causes BSOD? Also, why does it make your ram unstable? I'm a bit of a newb at this :p 
July 10, 2012 4:14:59 PM

aayjaay said:
I think a 4.4ghz OC with an IB (and a 212 evo which only costs ~£25) would be great for me. I don't want to go crazy with the overclocking (e.g. pushing a CPU to 5ghz). Also, I've heard that clock-for-clock, the IB is around 300mhz faster than the SB so would I be right in saying that a IB 3570k overclocked to 4.4ghz is around the same as a SB 2500k at 4.7ghz?

Another thing; do you know why the 100mhz increase causes BSOD? Also, why does it make your ram unstable? I'm a bit of a newb at this :p 



It causes the bsod at 4.5 because it's hit a voltage wall for that clock speed. Adding more vcore and/or turbo core can rectify it. My new goal is to clock back to 4.2, and undervolt for the summer, and try for 4.5 in the winter time.

The ram being unstable is the nature of the beast of overclocking; there are a lot of parameters to adjust to stabilise things, and time is what it takes.

a b à CPUs
a b K Overclocking
July 10, 2012 4:22:50 PM

aayjaay said:
I think a 4.4ghz OC with an IB (and a 212 evo which only costs ~£25) would be great for me. I don't want to go crazy with the overclocking (e.g. pushing a CPU to 5ghz). Also, I've heard that clock-for-clock, the IB is around 300mhz faster than the SB so would I be right in saying that a IB 3570k overclocked to 4.4ghz is around the same as a SB 2500k at 4.7ghz?

Another thing; do you know why the 100mhz increase causes BSOD? Also, why does it make your ram unstable? I'm a bit of a newb at this :p 


I don't think its that much quicker, its a bit quicker and definately warmer.

Don't know why your ram would be unstable if you are just increasing your multiplier, ram should run at the same speed.

Make sure you have manually set your ram voltage to the specified voltage.
a b à CPUs
a b K Overclocking
July 10, 2012 4:25:14 PM

Also what stability tests are you running?
July 10, 2012 4:38:02 PM

beanoslim said:
I don't think its that much quicker, its a bit quicker and definately warmer.


I've heard that the IPC on IB is ~10% higher than SB's IPC however I might be wrong. If it was ~10% higher though, that would come to around a 300mhz increase.
July 10, 2012 4:51:56 PM

Performance difference between the Sandy Bridge and Ivy Bridge is 3%. For 3% I would rather have much cooler temps. Intel's next chip series will have significant performance increases based on the Ivy Bridge technology.



Graphite946 said:
Just wanted to add: I just finished my 3570K, and with a hyper 212 evo, I'm sitting @ 4400 without ever touching the Vcore or turbo voltage. So stock voltage 3570K, and I'm at 4.4.

The moment I go to 4.5, I get immediate BSOD, and need to add voltage. It also makes my ram a little unstable. I'll push it later, right now doing a 5 hour prime 95 run.


I dont know how it is with the 3570K, but with the 2500k @ 4.5 is finiky. Its hit or miss, and alot of people have issues (including me) hitting a stable 4.5. Your best bet would be to back down to 4.4 or bump up to 4.6 and see what happens. My 4.5 was taking 1.38v to stablize (sorta), but 4.6 only took me 1.328 (I am very confident in its stability).
July 10, 2012 6:22:34 PM

Graphite946 said:
Just wanted to add: I just finished my 3570K, and with a hyper 212 evo, I'm sitting @ 4400 without ever touching the Vcore or turbo voltage. So stock voltage 3570K, and I'm at 4.4.

The moment I go to 4.5, I get immediate BSOD, and need to add voltage. It also makes my ram a little unstable. I'll push it later, right now doing a 5 hour prime 95 run.


Oh yeah, i forgot to ask, what temps do you have with the above setup?
July 10, 2012 6:58:52 PM

After about 16-18 hours of prime95 my temps were sitting at 70c-73c. Intel Burn Test hit 81c. Gaming I hit about 55c-60c, but this is also with a sandy bridge. Your Ivy Bridge will be a bit hotter, but may still be safe. You wont know until you up the settings, get the voltage straight, and test.

Edit: My bad, I forgot to mention I popped for 2 fans on my Hyper 212. It's not like an omg difference, but it chops off 2c-4c easily.
July 12, 2012 3:48:29 AM

aayjaay said:
Oh yeah, i forgot to ask, what temps do you have with the above setup?



Nearly exactly the same temps as darkoutlaw.

Though, I am only running a single fan. Going to put in a "mid case" fan to work with the turbulent air between the intake fan and the Evo heat sink.
July 12, 2012 5:53:29 AM

I am running a 3570k@4.5Ghz in my current build. With Hyper 212+ cooler and push/pull fans I never break 75c during 12hr Prime95 run. Current voltage(actual real world voltage) is 1.3v. Had to run voltage a little higher for the clock speed than I was hoping for, but overall I am very happy with my OC and temps, especially considering cooler and additional fan was only a $35 investment. As far as one of the people above stating that they didn't touch their voltages to get to 4.4, many boards will automatically overvolt if you turn up the clock speed and leave everything else on auto. Not sure if that is the case with his build, but it may be in yours. I strongly suggest checking your real world voltage with cpu-z or something similar. If I leave everything else at stock settings, and turn my clock speed to 4.5, it hikes it to a massive 1.45 volts. That's much too high, and will probably result in instability and excessive heat, not to mention almost a guaranteed lower lifespan.


i5 3570k@4.5Ghz@1.3v
Hyper 212+ Push/Pull
Asus Sabertooth Z77 Mobo
8GB G.skill DDR3 1600
EVGA GTX 570 OC’d
Sandisk Extreme SSD 120GB
Seagate 7200rpm 500GB
Cooler Master Silent Pro Gold 800w modular psu
Cooler Master Storm Enforcer mid tower case
July 12, 2012 11:10:40 PM

Using CPUz to monitor voltage, and not using autovoltage, I hit 4.4 on stock voltage. Though, I think to hit 4.5, I'll need nearly 1.3.

I'll tweak a bit when I get home and see what it does.
September 21, 2012 8:11:23 PM

ive got a 3570k @ 4.5 ~75c on prime95. the vlots are at +.01 but idk if thats enough to run for 8+ hrs
April 3, 2013 2:59:59 AM

im running the asrock z77 extreme 4 with a 2500k and the 212 ill be honest your tower almost has to be full atx to fit this heat sink but i added an additional fan to the back and im running a 4.7 oc and 1866 ram that has a 1.67 voltage requirement and two gtx 670s i dont get over 55-60c gpu or cpu running battlefield 3 ultra settings hitting 140-190 fps. however if i were to make a suggestion go 3rd generation because 2nd doesnt allow the pcie slotts to run full speed im running 8x not 16
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