Which CPU has the best OC potential? Let's vote!

[andy5174]

There will never be 100% fair comparison, but the CPUs I chose are all at the same/similar price level.

Cost-performance ratio not considered!

 

[obsidian86]

WR for each cpu

 

[andy5174]

I am surprised to see that.

However, it could just mean that the top chip of LGA1156 i7 is the best.

For example, the top PII-955 can hit 7GHz, but most chips stop at 3.8GHz.

It would be nice to have the record for AVERAGE OC on every CPUs.

 

[andy5174]

BTW, I heard many peoples claimed that i7-920 is the best regarding OC.

 

[randomizer]

Nehalem-based systems are very simple to get to 4GHz and don't require a great deal of effort to reach 4.5GHz either (just enough cooling). But for extreme overclocking it's not a great platform, as the WR shows. Under 6GHz is pretty poor as far as raw clock speed goes.

 

[obsidian86]

I am surprised to see that.

However, it could just mean that the top chip of LGA1156 i7 is the best.

For example, the top PII-955 can hit 7GHz, but most chips stop at 3.8GHz.

It would be nice to have the record for AVERAGE OC on every CPUs.

the i7 860 is not the top chip for 1156 that belongs to the i7 870

 

[andy5174]

the i7 860 is not the top chip for 1156 that belongs to the i7 870

[url]http://valid.canardpc.com/cache/banner/738683.png[/url]

I meant the best i7-860 CPU chips. Sorry for not making it clear.

 

[andy5174]

i5 is catching up! Where are the supporters of i7-860?

 

[bob5568]

I would have been chatting up the i7 860 but for you turning me on to the intel max vtt limit. I'm assuming that's not levied on the i7 920, which would suggest that chip by far exceeds the potential of my chip because you have easy access to the bclk at 200mhz. My board can do 180mhz with 1.21 vtt, but more than that I can't handle, which limits me to around 3.6ghz. I can get 3.8 but temps are in the mid 80s under prime 95 after an hour or so...I'd rather back it down, at 3.6 I stay in the mid 70s under 100% load.

Bob

 

[andy5174]

I would have been chatting up the i7 860 but for you turning me on to the intel max vtt limit. I'm assuming that's not levied on the i7 920, which would suggest that chip by far exceeds the potential of my chip because you have easy access to the bclk at 200mhz. My board can do 180mhz with 1.21 vtt, but more than that I can't handle, which limits me to around 3.6ghz. I can get 3.8 but temps are in the mid 80s under prime 95 after an hour or so...I'd rather back it down, at 3.6 I stay in the mid 70s under 100% load.

Bob

There is no difference between i5-750 and i7-860 reagarding the BCLK/Vtt.

I can hit 180 BCLK with merely 1.14V Vtt. 30 hours-2 minutes prime95 stable!

 

[andy5174]

Update: i7-920 is pulling away! i5-750 need your support.

 

[mindless728]

why no AMD chips, both the PII 955 and 965 would be close in price (a little on the lower side)

i didn't vote since i don't have experience overclocking the newer intel's (as i don't own one)

 

[RJR]

There is no difference between i5-750 and i7-860 reagarding the BCLK/Vtt.

I can hit 180 BCLK with merely 1.14V Vtt. 30 hours-2 minutes prime95 stable!

TURN on your HT and see all those 8 threads working away.

OH, that's right you only have 4, SORRY

 

[mpavao81]

I myself went with the i7 860 for the hyperthreading and slightly higher clock speed. I do like the hyperthreading. And it also runs very cool and overclocks well. I also chose a 1156 platform because i dont ever plan on using more than one video card.

 

[_GTech]

I think 3.6 is about the limit of the i5 without a water cooler, that's for sure...

 

[andy5174]

I think 3.6 is about the limit of the i5 without a water cooler, that's for sure...

My i5@3.6GHz

Vcore: a notch above STOCK voltage

Temperature: Under 18C ambient temperature, 100% load core temperatures are 48C-44C-44C-43C with Prolimatech Megashadow AIR cooling

AND: http://www.tomshardware.com/reviews/core-i5-750-overclock,2438-6.html

 

[bob5568]

Andy, those are nearly unbelievable temps. I get that the HAF922 is part of it, but I wonder even still how it could so low at load.

Maybe I should try the Prolimatech Magashadow...it sure looks like a beast of a hsf.

And the next question is, how high are you running your box for 24/7 operation? Must be higher than 3.6, eh? You clearly have headroom.

 

[andy5174]

Andy, those are nearly unbelievable temps. I get that the HAF922 is part of it, but I wonder even still how it could so low at load.

And the next question is, how high are you running your box for 24/7 operation? Must be higher than 3.6, eh? You clearly have headroom.

1. It's under 18C ambient temperature in the winter. I found that the core temps are all increased by 2C at (18+2)C ambient.

2. I use Arctic Silver 5 thermal compound, 2x 1800rpm CPU fans and Prolimatech Megashadow. Don't expect to get the temps I am at with cooling solution worse than mine.

3. The core temperatures given are under 100% load with Large FFTs test of Prime95.

4. You will NOT see the difference between top end and good-enough coolers at idle.

5. i7-860 runs much hotter than i5-750 thanks to the HT.

Hope these helps!

 

[bob5568]

Thanks Andy, it does indeed help. I found a website in a foreign asian language, but I could see a comparison chart of highend coolers, and yours showed the lowest load test temps at high fan rpm in the 50s, compared to mine in the 70s. I coudln't tell what cpu was being tested cuz of the language problem. But, at least it seems to jive with your cooler being a worthy investment.

I just may buy one, although first I'm going to measure my case, it appears to be pretty tall.

What fan or fans are you running on your meag-shadow? FrozenCPU.com offers four or five brands and I don't know which fans are the best.

Who knows?? I may make 4 or at least 3.8 yet!

Cheers,
Bob

 

[andy5174]

Thanks Andy, it does indeed help. I found a website in a foreign asian language, but I could see a comparison chart of highend coolers, and yours showed the lowest load test temps at high fan rpm in the 50s, compared to mine in the 70s. I coudln't tell what cpu was being tested cuz of the language problem. But, at least it seems to jive with your cooler being a worthy investment.

I just may buy one, although first I'm going to measure my case, it appears to be pretty tall.

What fan or fans are you running on your meag-shadow? FrozenCPU.com offers four or five brands and I don't know which fans are the best.

Who knows?? I may make 4 or at least 3.8 yet!

Cheers,
Bob

1. My case is also a HAF922 and there is still a lot of space left.
Besides, the space left seems to be still enough for a 200mm side fan, but I can't guaranty that as I don't have side fan installed.

2. I am using the CoolerMaster SickleFlow fan which is a (2000rpm +/- 10%, but EXPECT -10%) fan.
( http://www.coolermaster.com/category.php?category_id=3554 )

3. Even with a slightly below average chip, you should be able to hit at least 3.8GHz with the cooling solution used by me.

 

[andy5174]

Update: i7-920 is OWNING!

 

[andy5174]

why no AMD chips, both the PII 955 and 965 would be close in price (a little on the lower side)

i didn't vote since i don't have experience overclocking the newer intel's (as i don't own one)

There's no need to add them into the comparison, because their OC potential is a joke compared to the 3 CPU listed.

 

[mindless728]

There's no need to add them into the comparison, because their OC potential is a joke compared to the 3 CPU listed.

well then why not add them for the OC potential of the cheaper chips (ie PII X4 810, or the athlon II's)

i know the 810 can reach some decent speeds from 2.6GHz, i have hit 3.6GHz on old stock cooler from 125w TDP processor, could go higher with a better cooler as temps start becoming a problem

but as you wanted to keep the price/performance close i can see why (Phenom II keeps up in non-cpu intensive tasks like gaming)