Multiplier overclock

[Lean L]

I was messing around today and saw that my multiplier might be unlocked. It is xeon 5140. I never really understood multiplier overclocking, does it take the same toll it does as traditional bus oc'ing? I know 22X is not attainable but what about numbers like 10X without changing voltage? my temps are great. ~35 idle and max I've seen it after stressing is 58.

 

[aigomorla]

ummm..

unlocked multi means a true unlocked multi.

Usually values can be set anywhere from (6-12) - (50-62)x

Like shown below:
http://i125.photobucket.com/al...73/aigomorla/w3570.jpg

Does bios show u options to go that high?

 

[Lean L]

No, it has a range of 1-22, no inputting, selects via right, left arrow.

 

[daw123]

It could be since the max. multiplier for a Dual-Core Xeon 5140 is 7x. I got that from here:

http://en.wikipedia.org/wiki/L...odcrest.22_.2865_nm.29

If it allows you to go up to 22x then that would suggest that it is unlocked. Congratulations.

btw the link that Aigo posted was for a Bloomfield Xeon W3570. Different architecture and different multipliers (they go much higher because they are based off of BCLK rather than FSB frequency): http://en.wikipedia.org/wiki/L...omfield.22_.2845_nm.29

 

[Lean L]

I just tried to put it to 9X in the bios. Rebooted, CPU-Z had it down to 6X due to EIST. I tried running some apps to force it up but couldn't get it past the default 7X. That prolly means locked right? It is an IBM mobo, not sure how they usually do bios settings. lol, had my hopes up.

 

[daw123]

Originally posted by: iamanidiot
I just tried to put it to 9X in the bios. Rebooted, CPU-Z had it down to 6X due to EIST. I tried running some apps to force it up but couldn't get it past the default 7X. That prolly means locked right? It is an IBM mobo, not sure how they usually do bios settings. lol, had my hopes up.

You are probably right that its locked. To be honest I'm not that surprised since you didn't mention owning an ES chip or something like that, where it may be different to the retail version.

 

[Lean L]

lol, thanks. mutiplier oc'ing seemed interesting guess not doable for me atm.

 

[Billb2]

FSB x multiplier = CPU speed
333 x 7 = 2.33

So, every whole number change of the multiplier = a 333 mhz change in CPU speed.
But a whole nunber change of FSB = only a 28 mhz (7 x quad pumped) change in CPU speed.
But, changing the FSB also changes the memory speed too. (unless unlinked).

So, changing FSB allows more granularity in CPU speeds at the expense of possibly kicking memory into a no post speed.

An unlocked multiplier just allows you to have more combinations of FSB/Multi/divider so that you have a better chance of maxing both CPU and memory speeds.

 

[deimos3428]

When I was using an earlier version of my motherboard's BIOS that could not properly identify the processor, I noted that there was multiplier range of 1x to 26x, but could not change the option. This might be what you're experiencing; try upgrading your BIOS.