775 cpu model J or not

[DEVIL_DK]

Hi all

can anyone say if Model 540J is the 1 to go fore

is it a good oc cpu.

or is the 540 the bedst

[Soltani]

The J CPUs are the ones with E0 stepping, and clocks better than the other D0 CPUs.

[DEVIL_DK]

The J CPUs are the ones with E0 stepping, and clocks better than the other D0 CPUs.


hi :)

it run right now 250 fsb NP :)

[ar7786]

J or Not J doesn't make much difference. In the old days you can just get a 2.4GHz and raise the fsb crazy high. These LGA775 P4s won't let you do that anymore, for example, on 2.8GHz cpu. It'll turn itself off at a certain fsb, doesn't matter how well you cool it. Some people were able to achieve 300+ fsb with certain high priced model, which kind of defeat the purpose of overclocking.

[crotale]

Both can be E0 (and that's what you want), but the J is guaranteed to be E0.

There is no such a thing that they turn off them selfs at a certain FSB. That is a quality difference between motherboards.
If you reach 300FSB with a 540 I think should be pretty happy.

[ar7786]

There is no such a thing that they turn off them selfs at a certain FSB.

Have you seen anyone overclocked a LGA775 2.8GHz over 4GHz?

[crotale]

Have you seen anyone overclocked a LGA775 2.8GHz over 4GHz?

I'm sorry, but I'm not understand what you mean.
1. The chip itself, D0 or E0 stepping do not have a 4GHz limit since we've seen 5+Ghz and 6+GHz respectivly
2. This is just one of many screenshots showing that todays boards are capable of very high FSBs
http://img150.exs.cx/img150/9773/44154em.jpg
(and this is also with the 14 multi)

[ar7786]

What I mean is intel has done something to the lower speed LGA775 P4s to prevent them from being overclocked to very high speed by raising the fsb. You get something like this if you raise the fsb very high:
http://home.earthlink.net/~xhu7786/sitebuildercontent/sitebuilderpictures/520.jpg

Did you ever wonder why those OC gurus have to resort to a $700+ cpu for 14 multi so they can reach 300+fsb, instead of simply get a 2.8GHz? I bet they did and failed.

[crotale]

I think it is dangerous to draw such a generalized conclusions from only one problem.
Have you tried a diffrent version of CPUz for example?
Maybe your CPU is speed binned and just simply can't handle the speed.
Is the chip stable, as in Prime or SuperPi 32M just before that problem occurs?

What is your motherboard, and what are the specs of the rest of your system?

[DanIdentity]

I agree with crotale, that is a huge assumption to make based on what you're seeing. There is no way the CPU is actually running at 7.2 MHz.

Try a program other than CPU-Z, like Everest.

Also, as crotale stated, CPUs are speed binned - the lower speed CPUs can't overclock as well as the higher speed ones.

[lutjens]

Did you ever wonder why those OC gurus have to resort to a $700+ cpu for 14 multi so they can reach 300+fsb, instead of simply get a 2.8GHz? I bet they did and failed.

The reason why they use the $700 CPU is so they can have a chip representing the highest current manufacturing yield (and therefore highest potential overclock). While retaining the 14x multiplier of the 2.8GHz.

Compare the 2.8GHz and 3.8GHz. While they both may max out at the same speed, the odds are MUCH better than the 3.8 will out-overclock the 2.8, if FSB doesn't become a restriction. And with the high $$$ chip, they retain the ability to max out the CPU speed at the default multiplier, and know for sure of it's the board/memory or the CPU that is maxed out.

Which, coincedently, is why ES chips are very popular....except that the ES chips are much more flexible, with the full range of multipliers available (downward from the default).

[Apocalipsis]

Well, I have here a 530J (3.0) over an AS8 board and it likes high FSB, 4.0GHz at 267FSB fully stable, and boots windows even at 285x15.

Apocalipsis.

[lutjens]

Well, I have here a 530J (3.0) over an AS8 board and it likes high FSB, 4.0GHz at 267FSB fully stable, and boots windows even at 285x15.

That's great...but I'd bet a 3.8 would be able to do better...

Some lower speed grade chips are actually remarked high speed cores though...which is why overclocking is so popular as we attempt to find these chips that will do the same speeds as their high speed conterparts at dirt cheap prices:)

But buying the top chip ensures that you have the current top yield chip (no guesswork), so you'll be able to shoot for the high clock speeds necessary for bragging rights without being limited by a potential low yielding chip.

[enzoR]

id take the J

[enzoR]

That's great...but I'd bet a 3.8 would be able to do better...

Some lower speed grade chips are actually remarked high speed cores though...which is why overclocking is so popular as we attempt to find these chips that will do the same speeds as their high speed conterparts at dirt cheap prices:)

But buying the top chip ensures that you have the current top yield chip (no guesswork), so you'll be able to shoot for the high clock speeds necessary for bragging rights without being limited by a potential low yielding chip.

if he gets the 3.8E0 id agree since you can enable the 14x multi and go for FSB

[CrazyXP1700]

my 2.8 only would run at 3.71ghz... 14x265FSB 1.5125v... sometimes it wouldn't boot that fast... other times it would not always booted at 260FSB... i can give ya screenies of all my voltage settings which were all very low... and my cooling was definetly good enough for 4ghz atleast...

i was begining to wonder if it was my motherboard "Abit AA8 DuraMAX"... but then i got to thinking that the "unlock the clock" sets the 3.6 at 14*266 right... and thats higher FSB than my 2.8 could ever get to... soo i think that it is not a problem with my board... once you set up a 3.6 at 14x266... you should be able to increase the FSB more right? i mean your not really overclocking the cpu then! it's running the same speed

but theres got to be something up with the D0 cpu's or just hating 260+FSB...