Anyone changed to 68030/50 in their ACA630 to lower heat?

[Photon]

Was just wondering if there's any use in doing that (keeping the clock speed), the heat is much too high for my taste.

Anyone done it and noticed a difference? After 1.5 hours, I have to remove my finger from my ACA630 cooling-plate after (MAX) 1 second, it really burns.

So: does 68030/50 @ 25 MHz "run cooler"?

[FOL]

I have an ACA630/25MHz overclocked to 33MHz.
As I said before, it used to get very very hot (completly normal) before I overclocked it.

I have never had any crashing issues at all.

Are you using ACATune? if so which settings?

[Amigafanboi]

I've replaced the CPU in mine with a full 50mhz CPU and clocked it to 40mhz.
It gets very warm but then so did the Blizzard 1230 i used to own.

So far i've not had any problems running it at this speed.

[Matt020]

I have a DKB Cobra with 030/30 clocked to 33mhz.

It gets too hot to touch.

But its 100% stable, with no crashes.

Maybe the 030 runs hot and is just that way?

[roy bates]

try a fan?

[fitzsteve]

Yep, fit a small & slim chipset style cooler to the Heatsink above the 030, it'll probably run nice and cool then.

Passive cooling on these was to keep them silent, so of course the heatsinks get hot as they're doing their job and taking the heat away from the components.

I had a radical idea to remove the factory heatsink and replace with chipset cooler and vga heatsinks on the Ram and other IC's however since I rerely use my A600 I've left it as is.

(Just remember any tampering will probably void your warranty)

Steve.

[roy bates]

yes steve. its always a good idea to fit a fan on anything that gets hot.

he mite not have to remove the passive heatsink on this to fit a fan though, just fit a fan to the top of the passive one.just a thought

btw. the extra heat from accelorators adds to the ambiant temprature inside these closed units,and may harm your amiga and stabality.plus fans are alot cheaper than a replacement motherboard and cpu.

[DDNI]

leave the lid off! It only gets in the way of further hackery anyway! My A1200 is rarely fully dressed these days

[alexh]

Originally Posted by Photon

does 68030/50 @ 25 MHz "run cooler"?

All depends on your mask set.

68030/25@25MHz will output the same heat as a 68030/50@25MHz if they are the same mask set.

G40W and F91C are the lowest geometry (0.8um) and thus the coolest.
D66C and C74N are 1.0um and will be slightly hotter.

Check the corner of your CPU

[Photon]

Sorry guys, but alexh was apparently the only one who understood the question!

Thanks, will check, unless that voids the warranty.


If this is true alexh, then overclocking the same CPU never leads to higher temperatures, ever?

By the same token underclocking my ACA630-25 would not lower the temperature. All that remains is to add proper cooling, which I've done.

So far I've had a handful of reboot+a 4 hour and a 4 hour session with this, without a single hiccup.

Originally Posted by FOL

I have an ACA630/25MHz overclocked to 33MHz.

So only Amigakit staff can dare to think about overclocking!? How unfair!!

Originally Posted by FOL

As I said before, it used to get very very hot (completly normal) before I overclocked it.

I have never had any crashing issues at all.

Are you using ACATune? if so which settings?

As you know I have a thread for the crashes. During testing I occasionally tried without startup-sequence, didn't notice any difference in temp or crashing.

[alexh]

Originally Posted by Photon

If this is true alexh, then overclocking the same CPU never leads to higher temperatures, ever?

Overclocking leads to higher temperatures of course. Heat dissipation is a combination of mask geometry, input voltage and clock speed.

Originally Posted by Photon

By the same token underclocking my ACA630-25 would not lower the temperature.

?? If you lowered the clock frequency to say 20MHz it will run cooler. If you knew what you were doing you might also try undervolting.

All tricks any modern PC motherboard can do in software but will require hardware mods to ACA630

[FOL]

Originally Posted by Photon

Sorry guys, but alexh was apparently the only one who understood the question!

Thanks, will check, unless that voids the warranty.


If this is true alexh, then overclocking the same CPU never leads to higher temperatures, ever?

By the same token underclocking my ACA630-25 would not lower the temperature. All that remains is to add proper cooling, which I've done.

So far I've had a handful of reboot+a 4 hour and a 4 hour session with this, without a single hiccup.


So only Amigakit staff can dare to think about overclocking!? How unfair!!



As you know I have a thread for the crashes. During testing I occasionally tried without startup-sequence, didn't notice any difference in temp or crashing.

I just think you got hung up on this heat thing.
Jens has assured that its perfectly normal.
This is the only reason why I overclocked mine and it will void your warranty, changing the crystal.

Originally Posted by Photon

As you know I have a thread for the crashes. During testing I occasionally tried without startup-sequence, didn't notice any difference in temp or crashing.

Im convinced your issue was a dirty contact and re-seating the card has solved the issues.

[Paul_s]

Originally Posted by Photon

So only Amigakit staff can dare to think about overclocking!? How unfair!!

Well, its like this. Jens is like Tony the Tiger so has the secret formula of how to make Kelloggs Frosties... or in this case the ACA range of accelerators. He told Amiga Kit how to tweak without voiding the warranty Or just sent them a load of warranty stickers which also means if Jens reads this his ass is busted :s

There's a reason why FOL is short for Axel FOLey

[Photon]

Originally Posted by alexh

Overclocking leads to higher temperatures of course. ?? If you lowered the clock frequency to say 20MHz it will run cooler. If you knew what you were doing you might also try undervolting.

Just focused on what you said, "68030/25@25MHz will output the same heat as a 68030/50@25MHz if they are the same mask set." Would the 68030/50 underclocked to 25 run cooler than 68030/25 @ 25 or not?

Originally Posted by FOL

I just think you got hung up on this heat thing.
Jens has assured that its perfectly normal.
This is the only reason why I overclocked mine and it will void your warranty, changing the crystal. Im convinced your issue was a dirty contact and re-seating the card has solved the issues.

Of course I hope you're right, but the re-seating of the card followed the exact procedure used 6 months ago when I got it, and the socket was flush with the mobo before re-seating and the card had not budged at all.

I decide what temp I'm comfortable with in my Amigas. My enclosed A500-040 and A1200-060 did not get as warm as ACA630 - even with a much smaller cooler in each. Both have small fans.

[Amigafanboi]

Umm how did i not understand the question?

Me stating that an UNDERCLOCKED 50mhz cpu still runs as hot as one clocked at it's normal speed is a pretty definitive answer.

[Photon]

Sorry for missing that one Amigafanboi!

That's interesting and a nice overclock indeed

You have only changed CPU and oscillator, No flanges on memory or cpu fan. Correct?

[source]

What I did now this is for a vxl030 in a 500, was hot glue 2 small fans to the underside of the top case and soldered power leads to the 12 volt line coming from the psu connector.

[Amigafanboi]

Originally Posted by Photon

Sorry for missing that one Amigafanboi!

That's interesting and a nice overclock indeed

You have only changed CPU and oscillator, No flanges on memory or cpu fan. Correct?

Correct, at first i ran the CPU at 33 mhz and it still got hot, i'm not so sure it's just the raised mhz alone that raise the heat...if the cpu is busy then it will also generate a lot of heat even if underclocked.

[roy bates]

here is exactly what im triyng to say photon.do you know how an oven works?its basicly a heat source in a box with no airflow.

now translate that to your a600 with no airflow youll get what peaple are trying to tell you.

[alexh]

Originally Posted by Photon

Would the 68030/50 underclocked to 25 run cooler than 68030/25 @ 25 or not?

A 68030/50 and a 68030/25 with the same mask are the same chip. (Just a different printing on the top.)

Same chip + same voltage + same clock speed = same heat.

Running a 68030/50@25MHz is *NOT* underclocking WRT 68030/25@25MHz. You are running both at the same speed!

A 68030@50MHz will run hotter than a 68030@25MHz if you want to lower the temp you'll have to drop the voltage or clock speed.