700e running HOT at 933

[mbaker74]

Here's my set up:

P3 700e SL3XX OEM
50 Watt Peltier with Alpha h/s and fan
Abit SL6
128mb Micron pc133 RAM
Voodoo3 3500
Maxtor 7200 rpm 15 gb h/d

With the peltier it's running at about 50C under full load and 40C idle. Are these #'s normal with the peltier?

7x140 running at 960 right now (all I needs 40 more and I'm happy)

[mbaker74]

I was also wondering if anyone could help me out to getting to 1ghz.

Thanks,
Matt

[Roy]

That seems hot for a Coppermine. Where are you measuring it? Peltiers put out a lot of heat and may be corrupting your reading.

I suggest you try going without the TEC, just the Alpha, and push the core voltage to see if you can get that 1011/144 you want. I've run at 1.9V without smoke, and even 2.0 for a while. It didn't get me another speed notch, so now I'm back down to 1.8.

[krusty the klown]

Yes, it would be interesting to see what the temperatures are without the TEC.

I guess if you get a similar temp without it, that would indicate there's a problem with the peltier - either it's not powerful enough (50W...? Dunno really!) or there's a problem with the peltier setup.

Now, I ain't gonna pretend to be an expert in the things, but something crossed my mind: many people use a 'cold plate' that sits between the cold side of the peltier and the CPU. Many CPUs now only have a very small surface area available for direct contact with the heatsink. A cold plate is just a piece of (usually) copper. This would have the effect of coupling the entire surface area of the peltier to the surface area of the CPU.

I've seen peltiers rated in watts/cm^2. If there's no cold plate, the CPU is only getting cooled by a small area of the peltier and the rest of the area is cooling the surrounding air - not much use. If the peltier's cooling capacity/unit area exceeds the CPUs heat output/unit area, you'll be in trouble without a cold plate!

When running the peltier, how hot does the heatsink get? If it's running extremely hot, then it may not be able to dissipate the heat generated by the CPU plus the energy used by the peltier to shift the heat. Remember, that a peltier is just like an air conditioning unit in that is uses energy (electricity) to shift heat from one place to another. The total heat output to the hot side is the energy used to move the heat + the heat moved, so that heatsink has a lot more work to do when running a peltier.

- Just some thoughts on the matter http://sysopt.earthweb.com/forum/smile.gif

[Mungla]

I've got a question on a non-peltier related subject. I have a P3-700E FC-PGA SL3XX on a generic slocket adapter. I have tested it's overclocking potential up to 933 but I was afraid of the heat problems. I'm currently just using the heatsink they gave me at the retail store. Does anyone know what would happen if I were to put an 1/8" thick copper plate inbetween the CPU and my waterblock? The Socket converter has capacitors that are just a tad bit higher than the CPU's core. Unfortunately, this is my only cold plate, which I used on my peltier.

[thekingofpain]

It looks something like this: http://b.PostMyPic.com/b.nsf/Z/coppermineathlonspacerDTTY/$file/coppermineathlonspacer.jpg www.3Dcool.com (http://www.3Dcool.com) has em about 10$

[Mungla]

I don't need a stabalizer, I have one of those. But, $10+$5 shipping is steep. Anyone remember the guy selling those awhile back on Overclockers for $7? I bought one from him and it works like a charm.

King, I just need to know if 1/8" is too thick to give me good thermal conductivity without a peltier? I just need a solid 40mm or 50mm square block that is just thick enough to allow me to mount my waterblock. I have a FCPGA processor on a Slocket, but I have a waterblock that is designed to be capable of dual-peltiers; so it is as long as the Slocket. Any ideas where to buy one?