Tired of looking up info on I5 CPUs

Also I will be using the MSI Z77A-GD65 with OC genie II for the1 second 4.2GHz overclock

think of it this way;

the 2500K can reportedly run at 4.5ghz on air.

3570K runs hot once you raise the voltage at around 4.3ghz, give or take a 100mhz or two

a 3570K@4.2/4.3ghz should perform close to or better than a 2500k@4.5ghz in most, if not all cases.

if you have plans to OC further than 4.5ghz and get a custom water loop for cooling, getting a 2500K isn't so bad if you're worried about the heat, 3570k if you're not

If you're just worried about the number next to GHz, buy the older chip. If you want more performance, buy the 3570K. And that's just based on rumor, I haven't seen any proof the SB chips OC higher on average.

There is little reason to get the older Sandybridge, ok it can be clocked higher on cheap air but the Ivybridge is faster clock for clock so cancels out that advantage. This means you only lose the newer features like PCIe 3.0 by going for the older generation.

in all honesty what difference is it going to make ?

OK - so the two CPU's are very similar in real world performance. The 2500K has been known to go as high as 5.2Ghz on air (I *** you not). Mine will do 5Ghz.

The truth is however, that if I we're you, I would just get the cheaper of the two. In real terms you aren't going to notice ANY difference between the two.

Also - don't use OC Genie. It's quite simple to overclock manually. Just bump the vcore a tad and increase the multiplier. OC Genie uses an over-zealous amount of volts to achieve an underwhealming speed.

http://www.anandtech.com/bench/Product/288?vs=701

3570k is 5% better clock for clock. It also overclocks good and is newer architecture! Go with that cpu and press order!

if it makes a difference to you the 35 supports pci-e 3.0.

No more calls, please. We have a winner!  

Pick the least expensive/best combo you can find, and be happy.

pci-e 3.0. support.....is that a big deal.....getting a gtx 670 ftw as soon as I can afford it.......and that is a 3.0 card.

As far as OC genie I guess I see what you mean....I hope I can find someone that has a already set up clock I can refer to set up mine.

Just go for ivy bridge cpu, it has many more advantages other than just overclocking.
It will make you future proof. And future starts with version 3 of various interfaces.

4.5ghz on air? im using the heatsink off my socket 775 rig and i can do 5ghz on air

For the 3750 that cooler will work fine as log as you do not go over 4.2-4.3 GHz. if you want to go higher get a water cooler.

I have the 3750 with the same motherboard and a H100 and 6 case fans. at 4.2 I stay down in the 50-55c with max load. and do not use the OC Genie, as it will add unwanted power.

I may try to hit 4.9 just for fun. But at 4.2 the GPU (XFX 6950 2 GB) is the bottleneck.

On BF3 on ultra on a 27" monitor my GPU runs at 99% and my CPU runs in the 50% area.

There are some nice OC documents on Toms.

Go with the 3750 you will be happy.

Not an issue now ... and unlikely to be an issue any time soon.

even when it becomes an issue, it will only be an issue on the most extreme dual gpu cards.

But air is what I am going to be using and 4.2 does seem like a number that I will happy with..perhaps I will go with the sandy bridge....I cant afford the extra money for water cooling......

despite what most people say about newer being better, i stand by sandybridge being better than ivybridge for desktops. ivybridge only really shines in the mobile space imo.

I was running a stable overclock of 4.2Ghz on a 212 EVO with good temperatures (Stock voltage, can push my chip to 4.4Ghz without needing to bump it up).

My opinion is the 3570k over 2500k. Only reason for Sandy (as Finneous said) is if you care more about the frequency it runs at than the performance it gives.

my sandy out performs your ivy =P

Best answer selected by Xbob627.

You clocked it harder...
With ma'h watercooling I bet I could destroy your Sand(y) castle!

i clocked it harder because i can clock it harder. lets be serious, you are afraid of the heat in your ivy. i run my pc 24/7 with these clocks, for almost 2 years now. if i wanted to push it i could run at 5.1ghz

edit: and i do it on ancient air cooling. fact is sandy is a better overclocker and the ipc on ivy isnt that much better. sure you could run at 4.5 or 4.6 ghz and i could run at 5.0 ghz. fact is, you would still be running way hotter than i would be if we had the same cooling

sandy is a proven work horse that deals with heat like a champ. ivy does poorly with heat and hasnt proven itself able to handle the stress of running hot in the long term

The OP already said he's looking at a 4.2 GHz max OC so Ivy is superior.

Not concerned about Ivy's voltage/heat issues that much, I have a decent setup for dealing with that.
Have no real intent to clock it above maybe 4.5-4.6ghz anyway, which is achievable on air.
Just been a wuss so far and don't want to touch the voltage...

Also what temps are you getting on that 2500k? That is a lot of voltage and your on air.

I guess I should also say I have a low threshold for temperatures. Dont let my CPU get above 70c under load (gets to 65c, though it does depend on ambient a fair bit) as it has to last until Skylake (my planned platform upgrade).

75 degrees tops in prime, realistically 65 degrees tops

Edit: vvv i still dont think ivy is a better performer. it simply runs too hot to comfortably achieve the same level of performance as a 5ghz sandy. if you do manage to meet the performance of a 5ghz sandy, you will be doing it 10-20 degrees hotter.

Well that was because of the complete lack of knowledge of overclocking and was looking for the OC genie to fix me up to 4.2.......but was told to just do it myself which as of right now the idea has me shaking in my boots....I don't doubt ivy is a high performer but am a weenie don't want to take a chance of overclocking without water cooling.

Overclocking is fully possible without an extreme solution such as watercooling, a cheap aftermarket cooler will easily hold an overclock of 4.2Ghz.
Its even dead easy.

A 3570k is more or less guaranteed (theres always the chance you receive a lower quality chip) to run at 4.2Ghz without any extra voltage. Its literally just a matter of changing the CPU multiplier to 42. Boot back into Windows, run Prime for 30min to test for stability and your done.
Assuming you dont live somewhere ridiculously hot and you have a decent air cooler, temperature at that frequency shouldnt be an issue.

Thanks for all the info and opinions I think I am set

ok well I might build my bro a PC the begging of next year....if so I might get him the 3570k.................

XBob - Overclocking is nothing to be scared of.

If you mess it up, the computer just wont POST (Power On Self Test aka Motherboard wont start up).

Then all you have to do is reset the BIOS and try again. That is the worse thing that can happen.

Resetting the BIOS is one of three ways:

1 - convenient switch on IO panel of motherboard
2 - jumper on motherboard (just touch it with a piece of metal)
3 - lift and replace battery.

I have dont a lot of overclocking, I have never had to use '3'.

But really - to overclock is nothing to be scared of. Also 4.2 Ghz for a 2500K is EASY. You will likely have to do the following:

Access BIOS.
Change the setting for multiplier from '33' to '42'.
Save and restart (f10 usually).

TBH at 4.2Ghz I doubt you will have to give it anything else AT ALL.   Temperature and voltage requirements increase exponentially. So if it will do 5.0Ghz, you can probably get to 4.2 or 4.3 without giving it any more volts. Then 4.4 or 4.5 with Just a tiny bit of vcore. Then 4.8 will be requiring a bit more, but to get to 5 you will have to give it a lot.

ok sounds pretty good Ill see what happens when I get my new stuff....cant wait

My 3570k runs at 28-32 c with the Intel stock cooler I over clocked it for **** and giggles and hit over 4.2 with 70c running prime 95 on stock cooler that seems pretty good to me

get the ivy
Not much diff b/w the ivy and sandy except the fact that you get PCI-e 3.0 support which will be more future proof

this pick on swifty day ? i think your 2 posts were unneeded don't you ?