Finally....K6-2/350 @ 500 !!!

[denz]

Hooray!! After numerous failures I've done done it. My K6-2/350 finally reached 500MHz.
Below are the fruits of my labor:

K6-2/350 @ 5x100, 3.2Vcore, EP-MVP3G2
Max temp = 49C

CPU Dhrystone 1424 MIPS
FPU Whetstone 606 MFLOPS

Interger MMX 1332 it/s
Floating-pt. 3DNow 998 it/s

Denz(2:56AM Phils.)


[This message has been edited by denz (edited 01-05-2000).]

[This message has been edited by denz (edited 01-05-2000).]

[richamies]

whoops it went twice hehhe never click stop and change your piccy cos you WILL look stupid, even if ya wear shades afterwards http://www.sysopt.com/forum/wink.gif

[This message has been edited by richamies (edited 01-05-2000).]

[richamies]

Way to go there Denz! Ya make me proud(er) to be an AMD supporter!! Feel good about it mate you are now a club 500 member hehehe

Just watch those volts.......and remind anyone else who has a 2.2v chip NOT to go that high hehehe congratulations matey thats wonderful news!!! As a percentage you have managed to beat me! You are currently running at 142% of the rated speed, I'm at a 'mere' 137.5%. Just make sure she stays cool and dont be affraid to slow her down if she does play up, cos you will spend more tiem rebooting from hangs than the time saved by going quicker http://www.sysopt.com/forum/smile.gif

Treat her right she's a winner!

[psyklone]

bravo! i'm impressed .... and a bit jealous. http://www.sysopt.com/forum/wink.gif

[alpha]

LOONITIC!!! I like your style http://www.sysopt.com/forum/smile.gif

I've got a not-so-great cooler and all I've got is 428mhz@2.3v. With a better fan, It'd do 450 or 475 with an alpha.

Way to go man! Drop it back to 450 if you want your chip to last http://www.sysopt.com/forum/wink.gif

[denz]

Thanks guys. Actually it went as high as 504 MHZ @ 4.5x112, 3.3Vcore, and a max temp of 51C. Problem was my ISA sound card wouldn't load in win98. Got a better mem benchmark there but no sound card is not fun.
So I tried 5x100 and it works. Tried to lower the Vcore to 3.1V and I end up w/ BSOD.
So, I'm at 5x100 and 3.2Vcore. Anyway, the reason for my success is my new heatsink config. I've added a copper heat spreader between my cheapo heatsink and my cpu plus a thin layer of thermal paste in between. It's been known that copper has a better thermal conductivity than aluminum alloy but the latter radiates heat better. So, I just combined the two and my cpu temp dropped a couple of notch.
Any other ideas on how to drop my temp? Tried CPU lapping but it didn't work for me.

Well, gotta go to office now. It's 7 in the morning here.

[misha]

I'm really jealous!

how do you manage to keep your temp so low despite pumping 3.2v?????

I'm running k6 2 350@412.5 at 2.5v
and my temp reads 42ºc..now I'm really jealous.

[denz]

As I've mentioned earlier, I added a copper plate bet. my cpu and heatsink to act as a heat spreader. That made the difference and allowed me to jumped from 475/3.1V to 500/3.2V. Also, I have 1 80mm fan at the bottom front of my chassis sucking in fresh air. I also used a 60mm 4800rpm for my CPU fan. Add to that I have a 40mm ducted fan blowing air towards my cpu heatsink. And last, I have 3 40mm fans in my drive bay blowing air towards my heatsink.
Of course, I don't recommend the 3.2Vcore. This is a warning. Though I'm lucky enough not to burn my chip I've also shortened the life of my chip. Some chips may not be so lucky at 3.2V. In fact, there are reports of fried chips at 2.9Vcore. So be very careful when increasing your vcore. If you're not prepared to buy a new chip don't do it. 2.9Vcore and above are extremely dangerous zones. My chip currently consumes 57+ W of power at 100% load. At 3.3V it reached 61W. Just imagine how much heat that generates.

Oops, forgot to include. I'm using a cheapie oversized heatsink. When I say oversized, it's about 30% larger than the stock h/s of a K6-2/350.

denz

[This message has been edited by denz (edited 01-05-2000).]

[CMonster]

Hi Denz,

Thanks for letting us know of your success.

Here is a little copper cooling tip: listen carefully; It envolves bending a copper plate into a 90degree "L" shape and mounting TWO heatsink/fans:

make the copper spreader plate about twice as long as the heatsink bottom and add 5/8inch: Next,with the elongated side extending perpendicular to the mount clip you epoxy the plate to the primary heatsink with a THIN layer of epoxy - ONCE THE EPOXY IS HARD, bend the elongated plate upward to almost 90 degree, but leave about 1/4inch space between the plate and the heatsink for air to flow, Finally, epoxy a second heatsink/fan to the outside of the upright copper plate, align it with the top edge (leave the 5/8inch for clearing mobo components). Congratulations! YOU HAVE NOW DOUBLED YOUR RADIATING SURFACE! Attach the whole mess to the CPU with regular heat transfer compount and the standard mount clip. http://www.sysopt.com/forum/smile.gif !!!But be sure that you arange things so that the second heatsink is where it will not get in the way of anything!!!

Note, a light sanding before epoxy makes a strong bond.

Once you get what I am talking about here you may want to epoxy both heatsinks before bending that way you will get a good mount of the second heatsink without tweaking the metal.

To undo a screwed up epoxy job: First remove the plastic fans, next heat the unit on a stove or preferably outside with a propane torch, just until you can pop the copper off - DON't heat it until it glows! LOL! Use a razor blade and sandpaper to clean off the residue.



[This message has been edited by CMonster (edited 01-06-2000).]

[denz]

Hey, CMonster. That's a great idea. Now my old stock heatsink will be put into service again. BTW, I was browsing in Alpha's web page and looks like their into copper heat spreaders too. It seems they have a new line of heatsinks w/ copper heat spreaders. Check this out: http://www.micforg.co.jp/cindexe.html

[CMonster]

Okay thanks for the link - copper embeded, hmmm - nice way to phrase it.

Yeah I pretty much proved to myself that heat moves quickly through copper, but copper doesn't give up heat to the air as readily as aluminum. I think that is why the 100% copper heatsinks were poor performers.