PowerMac G5: What's your U3/Memory Controller Heatsink temp?

Hey guys, I just picked up a G5, runs great but I've noticed the memory controller heatsink is pretty darn toasty (currently around 150f/67C when idle). If I push it, it gets up to around 70c and then cools back down into the 60s.

It does worry me, but it appears to be stable. The processors are running really cool at 113-125f!

Anyone else? Thanks

 

lol I'm wondering why I haven't tried the compressed air approach.. I guess because I never have any sitting around.

I was just planning on yanking the board out (just haven't yet). Thanks for the advice

 

It turned out that one of the plastic retaining clips had come off, so maybe 1/2 or 1/4 of the heatsink was actually touching the memory controller. Since there's no temperature probes near it, I'm fairly confident that when you see "U3 memory controller" or "memory controller heatsink" temps, that's coming from the chip itself.

It also turns out, that this sort of thing kills a lot of G5s, so if you have a high U3 temp.. look into fixing it!

Now, I need to figure out what to replace the darn clip with! I'm thinking nylon nuts & bolts. One thing that caught me as strikingly odd was the grey thermal compound - I've NEVER seen that in an Apple product before and am beginning to wonder if someone tried to "fix" the problem (heheh). Maybe they did that? Doesn't seem a very Apple thing. It was, however applied in the typic Apple fashion (extremely overapplied!)

 

So I fixed the heatsink, but the temps still suck. It's not in the 70s, but it's in the mid-high 60s.

 

Meh, I'm going to run it into the ground. The worst that can happen is the motherboard craps out and I sell the machine off for parts and get my $50 back. Whatever.

 

Thanks for sharing that ^^

I ended up yanking the little blower fan off of its duct (literally, it's held on with rubber thingies and if you pull at it properly it'll just pop off and you're good to go), and have it (almost) hanging next to the video card atm.

Meanwhile, a (not ducted!) regular 80mm antec is in its place and with a light load, the temps are at a much more sane 60c. Even at heavy load, the highest I've seen is 64c so there's some good going on there.

With a proper ducting setup (will get around to it soon), I expect that to drop down into the 50s ^^ Glad to see that's.. somewhat reasonable ^_^