Pep66... Blow or suck?

[RainMaQer]

HEHE... sorry title sounds bad

Should the fan on a pep66 be blowing or sucking air through the heatsink? With sucking, my temps are horrible!!! Disregard my sig... I'm at default speed (800 MHz) and default vcore (1.70). Idle is looking to be about 31 C or so... and full load (running Seti) is 50 C!!! I've tried reseating the pep66 a dozen times... I'm using ASII... and still my temps are REALLY high. Motherboard is 25 C.

Thanks Peoples

 

[Randy]

From what I've been told most of the Alphas were designed to suck but I have seen lots of
people flip the fan to blow with good results. Give it a try and see if temps improve.
Randy

 

[Mr B]

From what I've been told most of the Alphas were designed to suck but I have seen lots of
people flip the fan to blow with good results. Give it a try and see if temps improve.
Randy

I did a review comparing the venerable PEP66T against the (then) new Millennium Glaciator (it can be found on the front page,in the "Tips and Techniques" area, under HSF's...)

I tested the PEP66 with three different fans, blowing and sucking. There wasn't much of a difference, but I seem to remember blowing was a couple degrees cooler...

I'll have to go look now...

(damn senility...I'm only 33, fer cryin' out loud! AARGH!)

edit...here's the article: http://www.overclockers.com/articles433/

Blowing did indeed seem to get a couple of degrees cooler...but again, your results may vary, depending on case/fan configuration....try both and see. It's not hard to flip the fan over...

 

[arch5]

I was using two PEP66s on my VP6 with the Delta 38s.

When the fans were blowing I got a 4-5*C better cooling than if the fans were sucking!

Those Delta's blow! Plus, if you have the Pep66 in a socket application be sure to mod the shroud to mount the fan on top.
(You probably have the version that is setup for sockets though).

 

[RainMaQer]

Well... I tried flipping the fan so it was blowing... no difference... perhaps an unnoticable 1 C difference... but still. Why on earth are my temps so freakin high... I've had better temps with a retail hsf I'm gonna fry my processor using what is supposed to be a REALLY good hsf How much of a difference does the fan on a Pep66 make? The one on it is a Sanyo Denki... I think it's only 12 cfm or so... seems like it's more... but I'm not sure.

 

[arch5]

If you've re-seated your PEP a few times and you KNOW it's not the problem, it sounds like your fan is not working well. Try a different fan. You should never see the 50*C mark with a PEP66.
That is unless the fan's not working right.

 

[FireMogle]

It's Mega-Maid, she's gone from suck, to blow. Back to the problem. The obvious first question is good airflow through case and ambient temps. But I would imagine you covered that well before now. Also, a problem that I had, is that the computer sits in a desk type thing, which builds up heat leading to hight temps. Or maybe the fan isnt powerfull enough?

 

[RainMaQer]

Ok... I rigged one of my 80mm fans to the pep66... I made my own 80 to 60 adapter out of cardboard But it works... for moving air that is... but my processor is STILL running hot... just after my last post... the temps had reached 60 C!!! Now i'm hanging around 55 C sometimes lower. I don't get this. I don't think it's my sensor. Idle temps are normal... if I run CPUBurn... even on high priority the temps don't go over 38 C... Seti is what pushes me up so high... and I don't see why... heck... it doesn't even stay at those high temps... It fluctuates... big time. It'll go down to 35 C, then 45C, then 55C... then drop back down to 35 or so again. I'm just waiting to see smoke coming from my case

*EDIT*
Found the specs on the 80mm fan I'm using. It's 80x80x25, 12V, 43 CFM. Nidec TA300DC Ball Bearing Fan Model # M33406.

Link

 

[RainMaQer]

Here's a look at what my temps are doing. While pasting this into paint... the temp alarm beeped and the temp jumped over 67 C!!!

 

[strokeside]

Are you sure your HS is on correctly?
i know that if you turn the clip around the other way, the HS doesn't sit properly, and is resting on one edge only.
When your HS is clipped in, try to wiggle it around to make sure it is on firmly. Don't wiggle it too much in case you damage the core.

As per my sig, I use an alpha PEP66U, with my fan blowing, and my temps are 28idle, 35->40 load.

Also, what thermal material are you using? ASII/Thermal Pad/Thermal Grease???

 

[Mr B]

Are you sure your HS is on correctly?
i know that if you turn the clip around the other way, the HS doesn't sit properly, and is resting on one edge only.
When your HS is clipped in, try to wiggle it around to make sure it is on firmly. Don't wiggle it too much in case you damage the core.

As per my sig, I use an alpha PEP66U, with my fan blowing, and my temps are 28idle, 35->40 load.

Also, what thermal material are you using? ASII/Thermal Pad/Thermal Grease???

I was just about to suggest that. Make sure the point where the "bend" in the clip is sitting directly over the cpu die. If the clip is on backwards, what you are experiencing will happen every time. Also, the clips on the PEP66 have been known to bend, and not hold the HSF flush...check for that as well.

Sounds more like the clip is in backwards to me.

 

[arch5]

Plus you might lay your computer on its' side so that your HS will not be pulling on one side. This will take the strain off your clips.

 

[RainMaQer]

Took the pep66 off last night and put the retail hsf on it... There was a 5 C difference... temps hung around 66 C or so. I've checked rechecked and checked the seating over and over again. I've with and without ASII... small difference. I think the internal diode is on the fritz. There's really no way for me to know for sure. Money is a SERIOUS issue right now so I think I'll just refrain from putting the processor under full load

 

[pixelstick]

Blow for sure!

I've got the honker Swiftech MC462A on my XP 1600 and it works great by the way if it blows down on the HS. I tried flipping the fan so it would block away from the HS and the CPU temps rose dramatically. I was thinking that if there was a way to seal the HS on all four sides that sucking just might work pretty good.

Good luck with your temps!

 

[RainMaQer]

Here's another pic... this time running Toast, Seti, MBM5, and browsing

 

[Silversinksam]

Finally got better temps I see

 

[RainMaQer]

That pic is decieving... and for a purpose. I took that pic while it sat at that temp for more than 5 secs. It does that sparaticaly (<-spelling) but shortly after it will jump into the 50's again... sometimes 40... then 50... then drop back down to the temp shown in the pic

 

[Yodums]

How bad are your temperature jumping back and fourth, I remember if it jumps back constantly like your diode maybe just fubar. I really don't think Intel will get anymore than 40+ stock @ full load.

Yodums

 

[RainMaQer]

Here's another look at this... this one is the latest version of Asus Probe. The idle temp in this version matches my bios reading. The graph shows how much my temps fluctuate... it updates in 1 second intervals. The low point it hits is 40 C... which I marked in blue... the high temp it hits is 54 C... which is marked in orange-ish color. The bar that runs straight across is the limit... which is set to 75 C... notice that the temp jumped OVER that limit... which is the red line IN the graph. The only thing running was seti.

 

[ThePunkGeek]

could it be that the heatsink isnt sitting flat on the core?
you could try lapping it.