Peltier + cache on a Slot A question

[Innoka]

I'm thinking off a peltier (86W) + GFD on a slot A here. My main worry is about the cache chips. Firstly, do slot A boards (mine is specced to go to 1GHz+) auto set the cache divider according to clockspeed, because there is no setting for me to tinker with in the bios. Second, the foam on the peltier unit is moulded around the cpu so there seems no cooling for the cache chips. Does that really work right because it seems odd to me. Do those chips get hot?

[Murphy]

Innoka (Apr 11, 2001 02:49 a.m.):
I'm thinking off a peltier (86W) + GFD on a slot A here. My main worry is about the cache chips. Firstly, do slot A boards (mine is specced to go to 1GHz+) auto set the cache divider according to clockspeed, because there is no setting for me to tinker with in the bios. Second, the foam on the peltier unit is moulded around the cpu so there seems no cooling for the cache chips. Does that really work right because it seems odd to me. Do those chips get hot?

I'm not so sure it's a good choise to put up a 86W pelt on a athlon that you are running @ 1GHz. The high speed athlons produce high wats, usually around 50, 60+, overclocked even 70 or 80W. Considering your speed, you must have a 0.18um core (750+ MHz standard). better would be to use 2 pelts, and put them beside eachother (total of 2x86=172W). A 86W pelt will never be able to deal with the power your athlon consumes. I'm at school now, I don't have links available, when I get home, I will give you some interesting links (athlon specifications, wattages). You can go for instance here (http://www.wizard.com/~scfoster/copper.html) where someone has done some Slot-1 cooling with dual pelt, a real good design.

About the cache chips: they don't produce much heat, but because cooling them really helps with OC'ing, I would strongly advice on some kind of cooling. And no, the cache multiplyer doesn't change automatically. You can change it by soldering on your PCB (the hard way), or by using a bios that supports L2 setting (asus k7v 1008.c does, what mobo do you have?). Otherwise you can use programs such as Mathlon to set your L2 with a bootfloppy. But as I said, I don't have links over here. Using a athlon that is standard lower than 850 requires cache multiplyer modification, 850 and higher is already at the lowest setting, keep that in mind!
If there's more you want to know, just reply here, I will look this evening (european time). Succes!

[Innoka]

Thanks. I do have a 0.18 processor made in February 2000 I believe.
At Tom's Hardware, Tom was saying that it was actually unnecessary to modify for cache divider, because the cache settings were automatically set up in the BIOS of boards according to the multiplier the cpu was working at.
With a gorb it runs at up to 53C without more case cooling, which concerned me. The gorb only contacts the cpu area of the cartrdge plate. Now I checked how many watts this K75 core@ 600MHz 1.6V it was dissipating, the answer was 33.6W (with Radiate). At 800, 1.75V it will be 50.2W, 1000 1.9V 70.5W
If I were to use two peltier I think they would need to be weak 50W ones, and would I have any sealing problems? I'm not desperate for a peltier!
If I don't get more than 800 out of it, I think I may as well get Duron setup to 1000 rather than spend money on a GFD etc.

[Murphy]

Ok, but I suggest you have a look at our beloved homepage, and select the PELTIERS topic (left side). Then read something overthere, especially the peltier basics. It states that, when you really want to chill your CPU to 15°C or even lower, you really need some overpower on your pelts, otherwise they won't handle the heat. The delta T rating is for zero-load!!! When it get's loaded fully, it will pump no netto heat and even warm up by it's own power use. Nor does it work 100% efficiently for the power it consumes. That's why heavy pelts like 120+ are recommended for AMD cpu's at high speed. When you use the more easy to use medium pelts, you can sandwitch 2 of them between 2 heatplates, like in the like I handed to you before. And just foam up as usual. Heredescription (http://www.geek.com/procspec/amd/k7.htm) is some more info to have a look at :) , hope it's usefull, radiate is a really good tool to read your wattage! Hey, I never got into pelts, because I wasn't willing to even screw up my computer more than I did already (the watercooling :) ). I run it 24/7 for seti, and my parent are complaining about electricity bills. Well, I don't have to tell you what pelts will do to your power use...

Very much succes with your project!! Enjoy

[Innoka]

Why are you getting only 800 if you know so much? Do you have a 0.25 core? Guess so. Could I really take this core to 1gig? I could keep that till the end of this year definite. Trouble with waterblocks (and even peltiers) is that I don't want to get one that's not adaptable to a socket A later.
I'm a bit disappointed nobody can really answer me about the cache, perhaps I would get more response from the newsgroups?