Cooling for Better 040 Speed

[Bunsen]

Five meg??? I'm amazed you could even install 7.5.x, let alone run it.

 

[joshc]

LOL. You know the 575 can take 68MB RAM total? Upgrade the RAM, and stick 7.6.1 on it.

How did you expect it to be anywhere near fast with 5MB RAM?

You could get away with 5MB RAM and System 7.1, but it wouldn't exactly be the experience you're looking for.

 

[Concorde1993]

Well, maybe, but the 575/475/605s were the last, best and fastest of the LC series.

Read the other part of my quote.

5MB of RAM

OS 7.5.5

Virtual mem is ON

That is absolutely incredible! I hope you have considered at least upgrading the RAM if you decide to stick with 7.5.5., but that probably would infringe on your attempts to better cool the system. I would recommend sticking with 7.1, and leaving the RAM just the way it is.

 

[Bunsen]

Adding RAM won't affect cooling in any way.

 

[Gorgonops]

Adding RAM won't affect cooling in any way.

Well, I suppose if you want to get technical more ram => more transistors => more power draw => more heat generated in the case and power supply == hotter computer overall, but... yes, it would have almost zero impact directly on how warm the CPU runs. ;^)

 

[Concorde1993]

yes, it would have almost zero impact directly on how warm the CPU runs. ;^)

Hmmm....interesting. I didn't know that. One would figure that the added RAM chips would draw in more power, generating more heat. I was going along the basis of traditional add-on cards- the more you install, the more heat is generated. It only sounds logical.

 

[MidnightCommando]

more ram => more transistors => more power draw => more heat generated in the case and power supply

AHAHAHAHAHAHAHAHAHAHA no.

DRAM is mostly made up of capacitive cells.

Furthermore, the extra power draw would be in the order of a few mA ... let's say that each DRAM IC takes up 0.2mA (i'm basing this off the mitsubishi m5m44400-60), then you have 16 ICs to a card, so 3.2mA - the DRAM runs at 5V so using P = I * E we get 5V * 0.0032A = 0.016W - that's right, just 160mW! Compare that the power supply to a LC575 is 40W according to Mactracker ...

(The M5M44400-60 is a 60ns 512kB (1kx4) DRAM IC contemporaneous to the LC5xx series and thus makes a suitable comparison)

I think Bunsen's assessment of the impact of Moar RAM on system cooling is dead-on. Practically non-existant.

 

[amatecha]

Dude, you should slap System 7.1 on that machine. You're seriously running 7.5 on a machine with 5mb of RAM? It's going to crawl. I highly recommend dropping back to 7.1 if your software is compatible. It uses way less memory and is typically somewhat faster.

If you drop back to 7.1, turn off virtual memory and you'll find even MORE speed increase. VM sucks. I absolutely refuse to use it because of how much it slows down the system.