temperatures for SiS 741GX northbridge

[Dino_Martino]

Hi!

I'm a little worried about my northbridge temperature... It's hot, even in stock setting, but way hotter when set to 200Mhz.
Does anyone know what the SAFE operating temperature for a SiS 741GX northbridge is?
No need to suggest solutions like fans, aftermarket heatsinks...
All I want to know is the temperature limit.
thank you.

[#43 fan]

Hi!

I'm a little worried about my northbridge temperature... It's hot, even in stock setting, but way hotter when set to 200Mhz.
Does anyone know what the SAFE operating temperature for a SiS 741GX northbridge is?
No need to suggest solutions like fans, aftermarket heatsinks...
All I want to know is the temperature limit.
thank you.

What is the temperature of the Northbridge? From what I recall, 60* C is around the maximum of safe operating temps.

[Dino_Martino]

my mobo doesn't support northbridge temperature sensing... I can't get hard numbers from it.
I can touch it without getting burnt, but it does start to hurt after 5-10 seconds... (when Oc'd.)
I read elsewhere about a heat limit of 100+°C which seems unrealistic.
Is there reason to worry as long as I can grab the heatsink and hold on without getting burnt?
Will adding another case modest casefan in the back do much good? Or am I better of fabricating some sort of fan to atach to the NB heatsink? (which is currently passively cooled). That's something I was planning on doing anyway, but I read somewhere that NB chips can handle heat better than CPU's, and that it's normal for it to run hot... Adding fans whould be... euhrm challenging, for problems and reasons I'll start a new tread about, to stay on topic.

[stroyal]

It's about 140 to150F then. (60c to 65.5c

I was a millwright for 33 years, and testing approximate temps with your hand, was a tool of the trade.
It's been a while but as I remember, most people can touch 120F (49c) indefinitely, but about 180F (82c) that drops to 1 second.

[#43 fan]

It's about 140 to150F then. (60c to 65.5c

I was a millwright for 33 years, and testing approximate temps with your hand, was a tool of the trade.
It's been a while but as I remember, most people can touch 120F (49c) indefinitely, but about 180F (82c) that drops to 1 second.

And a hot tiller muffler is instantaneous

5-10 seconds should be ok. Just ensure that there is no stability issues.

[Dino_Martino]

I'm going to add a fan to it anyway. the cooler the better
I've got a nifty little quite old cpu fan somewhere...

[Dino_Martino]

Stability is absolutely fine.
Yet cooling everything better should prolong lifespan slightly.
And I've got everything I need laying around so... I might as well slap the things on. Unless the're too loud. Only one way to fine out!

[stroyal]

Yep, I think you are OK, but more cooling never hurts.

My north bridge, as an old Celeron CPU cooler with 2" long fins on it, with no fan.
I just fired it up, and it's 21c. I'm pretty sure it never goes abouve 30c
But my chip set is a Nvidia, so it will be different.

[stroyal]

With an ambient temp of 60f, after 10min of Flight Sim X, My chip is 24c, and the CPU is 42c.

It was the easiest 20% overclock, I ever did.

[Dino_Martino]

Mine too . I never whould have tought Oc'ing this whould be this easy. Get in the bios, change the FSB, reboot, done! Hehehe.
I've got an old 1700+ standing around, with a heatsink. But I'm just gonna go with the fan. I've never installed a HS before, and things tend to get messy whenever I'm using sticky stuff

[Dino_Martino]

When we're talking temps here, is there anything else (apart from CPU and NB temp) I should look after when overclocking, when things are stable?
Also, you know what overclock I've got, by how much will it reduce lifespan, when everything is kept relatively cool?
Is it FSB speed, or CPU heat that decreases lifespan?

Double speed == Half life-time?

no wait... Double speed = Half Life time

[stroyal]

I don't think it will shorten the life, as long as you keep it reasonably cool.

Mines been running @3000+ since 2003

The Barton was one of the best overclockers in history.

The rumor is that they were all 3200+, and the plan was to bin them, to find the ones that didn't quite make it as a 3200+, and sell them as the lower clocked ones, down to 2500+

The problem was, the yield was so high, there were very few, that wouldn't clock in the higher range, and the majority, would clock to 3200+


As you can probably guess, binning is when they test and sort, the whole batch, for speed.

[stroyal]

This isn't a new practice, as the 386DX and the 386SX were the same fab.

The difference was the DX had a math co-processor, and the SX didn't.

The SXs sold for less, but were perfectly fine DXs with the math co-processor disabled.

Intel would damage a perfectly good DX chip to make an SX.

[Dino_Martino]

Commerce is a strange thing... Thank god there is something called overclocking, to relief some of the frustration.

[Dino_Martino]

I've got a 24V fan too.
Can I wire two outputs of the PSU in series to get a 24V output?

[Dino_Martino]

hmm euwkey appereantly that's the same as a short
Guess the outputs of a PSU aren't as seperate as I figured ^^

[stroyal]

You can do that, without a short. many video cards, come with jumper cables to do just that.
If you have a multi-rail PS, and one rail is not enough, the jumper solves the problem, by connecting 2 rails together.

BUT that is only parallel wiring it, which if it was 2 different rails would increase the available amps, but not the voltage.

You would need to wire in a series.
I know how to do that with batteries, but not a power supply

A 24volt fan will run at half speed with 12v.

[Dino_Martino]

I know.
is a 24V @12V better in any way than a 12V?
Since I've got a good 12V one right here.
Can't I wire the 12V and the 5V in series?

[Dino_Martino]

I shorted it, and now it wont boot. I've had this happen before, and it whould simply boot up again after some time, without changing any fuses.
How does this protection work? is it some sort of timer?

[stroyal]

It is circuit breaker, and it should reset itself, after a 30 seconds, or less.
After the breaker cools.

You can't wire anything in a series, on a power supply,
When you use the 12v and the 5v, you are using the 5v for the fan ground, and the 12v, for the positive. This will give you 7v to the fan.

I haven't had one apart in a while, but they used to have a soldered fuse, inside.
The ones I have had with that fuse blown, replacing the fuse didn't work, as they was a permian short somewhere.