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AS5 vs MX-3

post #1 of 19
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I just rebuilt my rig and noticed that after applying my AS5 that my temps are about 5-7c higher than before I rebuilt using the same tim and CM212+. I think i put too much paste on this time. So I am going to reapply the tim and was wondering which paste people have had better luck with. AS5 or MX-3? I have heard MX-3 beats out AS5 and was wondering what experiences you guys have had with it?
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post #2 of 19
AS5 has a cure time so you won't see it's full potential until it's cured. That being said, I use MX-3 on all my builds and it works like a charm. I think MX-4 is out, though.
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post #3 of 19
Don't have MX-3, but I do have MX-4. As far as I can tell even after past the 200hour curing stage of AS5 the MX-4 is better than AS5. MX-3 is thicker and harder to apply than MX-4 from what I heard though.
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post #4 of 19
Should we be using MX4/3 on our cpu's aswell as our gpus?
post #5 of 19
Nothing wrong with using it on either.
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post #6 of 19
Quote:
Originally Posted by yoshi245 View Post
Nothing wrong with using it on either.
I always thought AS5 was the best to use for cpu's. Would i be that little bit better off using mx4 on my cpu's from now on?
post #7 of 19
Quote:
Originally Posted by Roweyi7 View Post
I always thought AS5 was the best to use for cpu's. Would i be that little bit better off using mx4 on my cpu's from now on?
Where'd you get that idea? AS5 is old, it works fine if you got nothing else, and probably a bit better after curing, but there's plenty of options that are better than it now. MX-4 > AS5.
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post #8 of 19
All the good TIM manufacturers have a paste that is superior to AS5 now, including Arctic Silver (AS Matrix).
AS5 does have a recommended 200 hour cure time, so the temps should drop a little over that period.
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post #9 of 19
Yeah AS5 is still a great compound, but like others said, it is old and there are plenty of better alternatives available. It has a really long cure time which seems unnecessary when many others have no cure time. It's also very thick and doesn't spread easily, which I never realized until my last reapplication when I used Prolimatech compound instead and it went on so much smoother.
post #10 of 19
Quote:
Originally Posted by yoshi245 View Post
Where'd you get that idea? AS5 is old, it works fine if you got nothing else, and probably a bit better after curing, but there's plenty of options that are better than it now. MX-4 > AS5.
Why's everyone so down on AS-5 just because it's "old"? There are a few TIMs that beat it by less than a degree when tested side by side. In my experience, how well you apply the TIM and fasten the heatsink down play a much larger role. For instance, right now, I have Shin-Etsu X23-7783 on my Silver Arrow and I'm getting 3 or 4 degrees warmer on load than I did with the chillfactor paste that came with the Silver Arrow. I didn't think I did a good job this time and it shows. You have to heat up everything up with a hairdryer to get it to go on right. On the other hand, I never found AS-5 difficult to work with. Also, the break-in period doesn't seem to be as dramatic as it's made out to be. Put a small line down the middle and let the heatsink do the work. It's really not that thick in my opinion. I also think different pastes work better for different types of heatsinks: lapped, rough surfaces, polished surfaces, lapped cpu, etc.

This 80 way test in June 2009 shows AS-5 right at the top. Granted, I don't think MX-3 and MX-4 were out then, but still http://benchmarkreviews.com/index.ph...&limitstart=12

Here's another from the same time period showing similar results. http://www.hardocp.com/article/2009/...hootout_q209/4

I admit that MX-3 and 4 may be better as I haven't tried them, and I'm not trying to argue. I just wouldn't say to only use AS-5 only if you've got nothing else around. It's better than that. Hey, they actually sell it at RadioShack which is the only place anywhere near me that I can find thermal paste for a reasonable price!
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