Cooling down your system: heatsinks

[Amiga1992]

I suppose this would not work if you have an accelerator card, right?

[Zetr0]

@Akira

using a ram upgrade i am sure it would still work...

but an accelerator.... maybe not... or if it did, it could slow the system down...

for instance the FPU is governed by the on-board motherboard clock.... if you were running an 030@50mhz.... anytime it encountered FPU arithmetic it would be shunted to the FPU and only run at the mobo speed....

all this is theoretical though, as i have not seen this in the flesh before.... infact... untill now I thought you had to have some discrete logic on the board before you could use the FPU socket....

its groovey to know eh?

[Yoto]

To:rkauer
Thanks again friend for the schems.
I was not really thinking about adding more memory chips, i was thinking about replacing the ones in the mobo for some 1 ,2 or 4 mb each, it depends on the voltage, maybe the original power source from the dram would have to be increased...i dunno...

[Zetr0]

@Yotoxi.

There isn't enough chip addressing lines to access more than 2MB of chip ram i am afraid to say.

for extended ram, you have to use the Zorro Bus,

[Yoto]

To: Zetr0

[alphonsus]

Originally Posted by Zetr0

@Akira

using a ram upgrade i am sure it would still work...

but an accelerator.... maybe not... or if it did, it could slow the system down...

for instance the FPU is governed by the on-board motherboard clock.... if you were running an 030@50mhz.... anytime it encountered FPU arithmetic it would be shunted to the FPU and only run at the mobo speed....

all this is theoretical though, as i have not seen this in the flesh before.... infact... untill now I thought you had to have some discrete logic on the board before you could use the FPU socket....

its groovey to know eh?

The 68k design from 020 onwards allows for 8 processing units on one platform. These can be any combination of main CPUs and FPUs, but a maximum of one MMU (if I've read the wikipedia correctly).
So having an accelerated CPU on card and a motherboard FPU should in principle work but the control logic on each platform will dictate whether it will function or not.

[rkauer]

Originally Posted by alphonsus

The 68k design from 020 onwards allows for 8 processing units on one platform. These can be any combination of main CPUs and FPUs, but a maximum of one MMU (if I've read the wikipedia correctly).
So having an accelerated CPU on card and a motherboard FPU should in principle work but the control logic on each platform will dictate whether it will function or not.

Hello Alphie.

It depends on how C= routed the CS pin on the Amiga board. If permanent to Vcc, then you can't attach an accelerator to the Amiga who have its own FPU.

BTW: reading the Motorola datasheet, I discovered the 68882 can be used as a coprocessor to the 68000 (and 010) too! Yay!

BTW2: Zetr0 passed me his flu! With no direct contact!

His powers are growing!!!

[gklinger]

I was planning on putting a heat sink on my 68060 but I think I better get to work and add them to a bunch of chips just in case.

I may need to find me a sturdy fork.

[Charlie]

Originally Posted by alphonsus

My BlizzPPC doesn't have a heatsink on the 040 - 25MHz.

Do people think I should put one on?

There's a fairly practicable way of judging what chips could do with a heatsink:

-Undo the screws.
-Load the 'pute with some software that will make it work hard for a bit.
-Lift the lid & touch her up a bit - - the chip packages, stay away from legs & conductive tracks. Also make sure you earthed yourself FIRST.

-Cool / warm? No worries.
-Hot / Damn hot? Needs a heatsink.

Tips:
-Heatsinks that attach with a sticky pad aren't great - better than nothing.
-Try to use a good thermal goop instead - for Amiga-stuff probably one of the adhesive types.
-Superglue is not a good heat conducter - better than nothing, and what if you want to get that heatsink off again?
-For best performance you can use a high quality goo like Arctic Silver & a couple of tiny dots of superglue @ the corners for mounting. (over the edges, not between HS & chip) - Over-kill?

-Give some thought to airflow when orienting the fins on your heatsink(s) - a small fan sucking air through the case can be a great help - even for chips with no heatsink.

[alphonsus]

@Charlie

Cheers!

[Paul_s]

No need inside a 1200 imo... those chips probably run way within their temp tolerances.. plus there's no intake/exhaust fan and it'll just end up being one noisy sod if you went that route

68040 upwards/PPC stuff would be the only things I'd bother heatsinking...

[Amiga1992]

Originally Posted by Paul_s

No need inside a 1200 imo... those chips probably run way within their temp tolerances.. plus there's no intake/exhaust fan and it'll just end up being one noisy sod if you went that route

68040 upwards/PPC stuff would be the only things I'd bother heatsinking...

I put inside a slim fan which barely makes any noise.