3.4 <> 3.4 - Page 2

lavalamp · 2009-03-10, 10:15

Quote:

Originally Posted by lavalamp

3.4 GHz P4s were available in Northwood, Gallatin, Prescott, Prescott 2M and Ceder Mill families.

http://en.wikipedia.org/wiki/List_of...icroprocessors

petrw1 · 2009-03-13, 00:01

Quote:

Originally Posted by lycorn

As somebody posted above, PIV 3.4 came with different cores. Make sure one is not a Northwood and the other one a Prescott, for example. Prescotts were less efficient than Northwoods, and the difference in timings you posted is, AFAIR, compatible with one being a NWood and the other a Prescott.

Here are the CPUID runs main screens from both ... both Prescott. But one has a 17.0 multiplier entry. Can someone explain this in Layman's terms...is this actually an indication of overclocking or just a faster bus? And would this alone explain the 20% better thruput or is it more likely still clutter on the work machine? Even in short bursts on the work machine (i.e I set the iterations low) the iteration time still does not do better than 0.032 compared to a consistent 0.027 for the Home version.

lavalamp · 2009-03-13, 00:54

The fact that CPUZ can't get some information is interesting, that could indicate a driver issue on the work PC. Also interesting is the report of just one CPU thread on the work PC, so perhaps hyperthreading is disabled in the BIOS

If hyperthreading were disabled on the work PC, then other programs would have to steal cycles from Prime95, but on your PC, so long as an instruction doesn't use the same part of the core that P95 needs, it can share the cycle.

CADavis · 2009-03-13, 01:46

yeah something is not right with that second one. Which screen is from which computer? It seems HyperThread is enabled on the first but not the second, but it could be a side effect of whatever is causing cpu-z not to be able to see all the additional info.

edit: oh i see the pics are labeled. there is a probly a mainboard driver or cpu driver missing or messed up in the work machine, can you show screens of the mainboard tabs?

edit: also, cool air coming out of the vents doesn't mean it isn't overheating. actually that seems to me like the heat is actually getting trapped inside, same reason that a CPU heatsink should feel hot, not cool, because that means it is taking the heat away from the CPU.

try running cpu-z while prime95 has been running for a while, and look at the cpu speed to see if it may be throttling at all.

petrw1 · 2009-03-13, 03:54

Quote:

Originally Posted by lavalamp

The fact that CPUZ can't get some information is interesting, that could indicate a driver issue on the work PC. Also interesting is the report of just one CPU thread on the work PC, so perhaps hyperthreading is disabled in the BIOS

If hyperthreading were disabled on the work PC, then other programs would have to steal cycles from Prime95, but on your PC, so long as an instruction doesn't use the same part of the core that P95 needs, it can share the cycle.

Good point....when I ran this at work I did get an error about a missing driver but I ignored it and let it continue. I have limited access to my work PC; some software I cannot even install or run so I may not get past the driver error.

It definitely has multithreading though...prime95 tells me so.

Maybe I will open it up and check for excessive dust.

I'll see about printing other tabs.

Thanks

petrw1 · 2009-03-13, 17:40

Note a lot of blanks....still getting the driver error. Probably not enough Admin rights.

Home PC screen shots coming soon

petrw1 · 2009-03-14, 00:15

No driver issue....much more data available:

xorbe · 2009-03-17, 01:53

need all screens for WORK pc too...

petrw1 · 2009-03-17, 03:34

Quote:

Originally Posted by xorbe

need all screens for WORK pc too...

Right above the Home PC post....but due to driver issues some values are blank.

lavalamp · 2009-03-17, 04:30

On my PC CPUZ also blanks out values for some fields, I've found that it only does it if my core voltage is over 1.55 V (Intels reported max safe core voltage).

Though I can't see it being the same reason why your work PC has missing info in CPUZ, unless someone who didn't have a clue what they were doing got into the BIOS.

Since they do appear to be identical CPUs, and you can see that hyperthreading is enabled on both, and the same RAM is installed in both machines, it simply has to be software based, which probably means there's very little you can do, short of talking to a sympathetic admin.

petrw1 · 2009-03-30, 18:32

REMINDER: They are both Hyperthreading PIV 3.40 ...

The Work machine has slightly better iteration times with:
Test
Worker Windows...
Multithreading (CPUs to use): 1

The Home machine has slightly better iteration times with:
Multithreading (CPUs to use): 2

2009-03-13, 01:46	#15
CADavis Jul 2005 Des Moines, Iowa, USA 170₁₀ Posts	yeah something is not right with that second one. Which screen is from which computer? It seems HyperThread is enabled on the first but not the second, but it could be a side effect of whatever is causing cpu-z not to be able to see all the additional info. edit: oh i see the pics are labeled. there is a probly a mainboard driver or cpu driver missing or messed up in the work machine, can you show screens of the mainboard tabs? edit: also, cool air coming out of the vents doesn't mean it isn't overheating. actually that seems to me like the heat is actually getting trapped inside, same reason that a CPU heatsink should feel hot, not cool, because that means it is taking the heat away from the CPU. try running cpu-z while prime95 has been running for a while, and look at the cpu speed to see if it may be throttling at all. Last fiddled with by CADavis on 2009-03-13 at 01:52

2009-03-13, 17:40	#17
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 4695₁₀ Posts	All screen shots for WORK PC.... Note a lot of blanks....still getting the driver error. Probably not enough Admin rights. Home PC screen shots coming soon Attached Thumbnails

2009-03-14, 00:15	#18
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 3·5·313 Posts	HOME PC --- all screens No driver issue....much more data available: Attached Thumbnails

2009-03-30, 18:32	#22
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 3×5×313 Posts	Another Curious Oddity.... REMINDER: They are both Hyperthreading PIV 3.40 ... The Work machine has slightly better iteration times with: Test Worker Windows... Multithreading (CPUs to use): 1 The Home machine has slightly better iteration times with: Multithreading (CPUs to use): 2

2009-03-13, 00:54	#14
lavalamp Oct 2007 Manchester, UK 23×59 Posts	The fact that CPUZ can't get some information is interesting, that could indicate a driver issue on the work PC. Also interesting is the report of just one CPU thread on the work PC, so perhaps hyperthreading is disabled in the BIOS If hyperthreading were disabled on the work PC, then other programs would have to steal cycles from Prime95, but on your PC, so long as an instruction doesn't use the same part of the core that P95 needs, it can share the cycle.

2009-03-17, 01:53	#19
xorbe Feb 2009 73 Posts	need all screens for WORK pc too...

2009-03-17, 04:30	#21
lavalamp Oct 2007 Manchester, UK 23×59 Posts	On my PC CPUZ also blanks out values for some fields, I've found that it only does it if my core voltage is over 1.55 V (Intels reported max safe core voltage). Though I can't see it being the same reason why your work PC has missing info in CPUZ, unless someone who didn't have a clue what they were doing got into the BIOS. Since they do appear to be identical CPUs, and you can see that hyperthreading is enabled on both, and the same RAM is installed in both machines, it simply has to be software based, which probably means there's very little you can do, short of talking to a sympathetic admin.