howto: tell wich cpu's allow 14 multi?

[kristos]

ok on some motherboards with latest biosses, with some CPU's, it's possible to use a multiplier of 14.

but how do I know wich cpu's will allow for this 14 multi and wich ones won't?

[uclajd]

ok on some motherboards with latest biosses, with some CPU's, it's possible to use a multiplier of 14.

but how do I know wich cpu's will allow for this 14 multi and wich ones won't?The CPU lock free feature only works with the following socket478 chips:
3.2E C0 and possibly the E0 (not sure) but not the D0, and all the steppings of the 3.4E's.

See: http://xtremesystems.org/forums/showthread.php?p=588921#post588921

[kristos]

mjah,

I've seen people reporting their C0's didn't do the trick (yes they were 3.20 gig or more cpu's)

and I've heard E0's didn't do the trick but now I noticed in this post that it does work :
http://www.xtremesystems.org/forums/showpost.php?p=687485&postcount=31

there's only one 3.8 model and it's an E0 btw :
http://processorfinder.intel.com/scripts/list.asp?ProcFam=483&NoNav=NO&CorSpd=6849&SysBusSpd=ALL&MfgTech=ALL&step=ALL&cache=ALL&PkgType=ALL&btnFOS=Filter+on+selections

none the less, it be nice to know how to tell the cpu's (E0's) that have this apart from the ones that don't. I read in another thread that it's because some cpu's have speedstep (they allow for 14 multi) and some don't. but where would I need to look to find out wich cpu has speedstep? (if this is statement is true anyway)



so, all 3.4E's... s478 too right? :) (just double checking, that's all)
http://processorfinder.intel.com/scripts/list.asp?ProcFam=483&NoNav=NO&CorSpd=6135&SysBusSpd=ALL&MfgTech=ALL&step=5420&cache=ALL&PkgType=6544&btnFOS=Filter+on+selections
is there a difference between these two?

[wwwww]

and all the 200FSB 2.8GHz p4s

[kristos]

Actually, those get an 8x multiplier option ;)

[batboycaver]

Go to the Intel s-spec finder and look for the processors that are rated 115w, these seem to consistently be able to drop the multiplier down to 14X regardless of stepping.

[DanIdentity]

For LGA775, any CPU with the performance compatibility guide rating of 04B (performance) supports the 14 multiplier. You can find the rating on the Intel spec finder.

[ed.howell]

The 14 multi options are as follows:

Socket 478 3.2 C0, 3.4 C0&D0. None of the E0's on socket 478

Socket 775 3.4 and above D0. I believe only the "J" series E0 stepping chips have the 14 multi available.

I could be wrong about the Socket 775 chips but I am pretty sure. The Socket 478 chips I am positive about.

Hope this helps

Ed

[lutjens]

Get a newer mobile P4 chip...they have EIST and downward adjustable multipliers...(including 14x);)

[kristos]

The 14 multi options are as follows:

Socket 478 3.2 C0, 3.4 C0&D0. None of the E0's on socket 478

Socket 775 3.4 and above D0. I believe only the "J" series E0 stepping chips have the 14 multi available.

I could be wrong about the Socket 775 chips but I am pretty sure. The Socket 478 chips I am positive about.

Hope this helps

Ed
thx it sure did, I was considering buying a 3.4 E0 s478 but now I certainly won't. too bad though...
Get a newer mobile P4 chip...they have EIST and downward adjustable multipliers...(including 14x);)and how do I recognize those? :)

and they will fit won't they? cuz I haven't been following the whole Intel mobile on desktop board thing. I read something in another thread about braking off a pin or something :confused:


*edit* going through that mobile thread in the "best of intel" subforum, it seems P4M's aren't all that interesting unless you have a board that can do insane fsb's because they default to a 12 multi. *edit*

[ed.howell]

thx it sure did, I was considering buying a 3.4 E0 s478 but now I certainly won't. too bad though...

Just get a 3.4 D0 stepping chip. I am very happy with mine. Check my sig. I think this chip could easily do 4.4-4.5+ on a Vapo. :D

[kristos]

my 2.8c m0 does 4 gig on air so the overclock I might gain is neglectible imho and the extra cache doesn't justify such a pricy upgrade :)

[lutjens]

and how do I recognize those?

Go to Intel's support website and see the S-spec numbers associated with the CPUs...and hunt one down.;)