althius, it means that you simply need to increase Vcore. If your ambient is near 22c, and the temp at 55c is the hottest Core (and it's correct), then since you have a TRU120E, you have ample headroom. Increase Vcore BIOS to 1.525, but don't be concerned about this value. In CPU-Z, Vcore Idle is important, however, Vcore Load is the primary consideration. The Delta between the two values is called Vdroop.
Asus P5K Deluxe @ 450 x 8
Corsair 800 C4 @ 900 - 1:1 @ 4-4-4-12
4Gb - 4 x 1024 - Vdimm 2.3
Also, from the Temp Guide:
Section 12: Overclocking
Every CPU is unique in it's overclock potential, voltage tolerance, and thermal behavior. If the maximum stable overclock is known at 1.35 Vcore, then each increase of 0.05 volts will typically allow a stable increase of ~ 100 Mhz, and will result in a corresponding increase in CPU temperatures of 3 to 4c. Ambient and Vcore are the most dominant Variables affecting temperatures.
Please post your Ambient, and define your temperatures as well as which test was used.
Compu, thanks for taking the time to talk to someone about this for the 1,000,000th time. I have my CPU temp as a ??, becuase I can't get Speedfan to work properly under VISTA64. I believe that is what I need for that reading.
Also I small note on my V-Droop. I'm seeing a 'double droop', and by that I mean when I first start out, I have a Vcore Load of 1.456V (0.048 droop), and then after 2 to 3 mintues, I get the second droop down to 1.440V. I see this at any Vcore.
I really had to go a long way to get from 3.5Ghz to 3.6Ghz. Here is my info for 3.5Ghz
GA-P35-DS3L @ 389 x 9
Patriot @ 800 - 1:1 @ 5-5-5-15
4Gb - 2 x 2028 - Vdimm 2.2
I'd love your feedback on this. I am almost of the opinion I'm just better running at 3.5Ghz, since I'm pushing so hard to get to 3.6Ghz (And I still haven't had a chance to run a long blend... I'll do it overnight tonight).
Also, when I go and 'retighten' my timings... will I need to adjust any Voltages? (I've already got +.4V for the RAM) Or do you think I'll need to leave them loose to maintain this stability?
Thank you very much for your time.
EDIT: Something else I just noticed. Under the BLEND test, my Vcore is different than the Small FFT test. It is also my fluid, bouncing between 1.472, 1.488, 1.456 altough not in that order. I haven't read about that anywhere else... is that known and normal?
As cnumartyr said, since 3.6 = 9 x 400, which yields DDR2 800 at a perfect 1:1 ratio, there's no reason your RAM shouldn't function properly at it's rated specifications.
Concerning Vdroop, one of the primary reason that cnumartyr and I purchased these Asus P5K series motherboards is that they have a BIOS feature known as "Voltage Damper" which is also called "Line Load Compensation" on more recent versions. The purpose of this feature is specifically designed to minimize Vdroop, and as you can see, it works extremely well. This feature was also highlited in a Tom's Hardware motherboard article written this past fall.
Vcore is created on the motherboard by voltage regulators which are fed from a +12 volt rail in the power supply. Again, as cnumartyr said, it's typical for any power source to to sag or "droop" as load increases. This is quite normal and expected, although 64mV is a considerable amount of Vdroop.
Since Prime95 "Blend" represents a fluctuating Load due to the cyclic nature of each test series, the fluctuating Vcore which you describe is simply the motherboard's voltage regulator circuits responding to a fluctuating Load, and can be graphically observed using SpeedFan "Charts" to display Vcore.
Have you tried SpeedFan 4.34 BETA 38? I haven't recommended it in the Temp Guide because it requires users to jump through some registration hoops, which many users may find too complicated or discouraging, as the BETA expires every 30 days, and requires the latest download to overwrite the executable.
Also, what is the CFM rating of the 120mm fan on your TRU120E, are you testing at 100% RPM, and which utility and version are you using to display your temperature?
The 64mV vDroop.. I think this is normal all things considered. He has a 4 Phase vReg without heatsinks, not sure if it is analog or digital, however my Blood Iron had a 4 Phase Digital vReg and was (at 3.6 GHz) drooping as much as 120mV.
I agree 64mV is quite a bit, but considering the board and the power demands of the Quad, I would be quite happy.
The other reason I chose the P5K-E is it is one of the cheapest solutions out there with true 8 Phase vRegs.
Understood cnumartyr. We only differ in perspective. If I recall correctly, the older Asus A8E boards were notorious for excessive Vdroop, and my old MSI K8N Neo 4 Platinum had an 88 millivolt Vdroop, which made it a bitchy balancing act to get my Opty 170 stable at 3.0Ghz, and resulted in a high Idle temperature.