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A counter point to AMD not being good for mid-high end - Page 25

post #241 of 355
Agree - this could have been set with the other thread, but still interesting and the thread is ' A counter point to AMD not being good for mid-high end '

And I hope the answers are going to dwell on that only thumb.gif
post #242 of 355
That's certainly very interesting and definitely makes a lot of sense.

I guess the question I have for you, then, that immediately stands out: what is the melting point of silicon?

Additionally, if you know this one I'll give you a rep. What's the general max safe temp for a VRM?
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post #243 of 355
Quote:
Originally Posted by neurotix View Post

That's certainly very interesting and definitely makes a lot of sense.

I guess the question I have for you, then, that immediately stands out: what is the melting point of silicon?

Additionally, if you know this one I'll give you a rep. What's the general max safe temp for a VRM?

According to Core Temp, the maximum junction temperature of the FX-8320/8350 is 90c.
    
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post #244 of 355
At about 150c stuff start melting.

There. tongue.gif
post #245 of 355
1,414 °C - Googled it biggrin.gif

now can i have my sweeties? thumb.gif
post #246 of 355
Quote:
Originally Posted by neurotix View Post

Additionally, if you know this one I'll give you a rep. What's the general max safe temp for a VRM?

Assuming you're concerned with the max temp of the MOSFETS themselves, junction temps as high as 175C are "supported" on some modern MOSFETS, though that's very nearly the melting point of the solder holding it to the board so I wouldn't want to be anywhere near there personally... Though in theory the temps of the package would be lower than the junction temp by a margin that I honestly couldn't guess, so there's probably plenty of room for error there before the parts start falling off the board.




I expect the junction temps in AMD CPUs probably do reach ~90C pretty often. When we look at "intel" CPU "temp reporting" that is probably much closer to a real "junction temp."
Edited by mdocod - 3/27/14 at 3:34am
     
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post #247 of 355
Quote:
Originally Posted by mdocod View Post

Assuming you're concerned with the max temp of the MOSFETS themselves, junction temps as high as 175C are "supported" on some modern MOSFETS, though that's very nearly the melting point of the solder holding it to the board so I wouldn't want to be anywhere near there personally.

Who the heck makes circuit packages that can withstand 175c on their low power fets? I want to know so I can stay away. Never mind that, how is the board supposed to withstand the conducted heat from that? Seriously, 150c is the typical junction temperature on mosfet packages, and even that is pushing it, many boards cannot even take that.
post #248 of 355
Well, just because the MOSFET they might snag for use on a board is rated to survive up to 175C junction temp doesn't mean that it can actually be utilized at those temps in all actual applications. The very low voltage, high current nature of a CPU power supply design would be very susceptible to such large temp swings (small changes in resistance due to changing thermals may have significant impacts at voltages this low).

I would actually be comforted to know that the MOSFETS in the VRM on my motherboard were technically capable of surviving J-temps of 150-175C+. Obviously a design that is intended to be surface mounted on a PCB can't run these sorts of temps, so that would mean they would be forced to increase the number/sizing of the MOSFET configuration. The result of which would be a system designed to run the MOSFETS far away from their max rated temps, which is preferable IMO.

In some applications, these mosfets are remote-mounted on heatsinks. In applications that are less sensitive to minor changes in resistance (higher voltage) running them closer to max temps is less problematic.
     
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post #249 of 355
Yeah, but when mounted to a big heatsink on a PSU is a whole different story.

I'd rather have a package with lower temperature limit but over-temperature protection, than a package that can survive the heat but kill the board or de-solder itself in the process. tongue.gif
post #250 of 355
my fx 6300 and 7950 at 1100 core will kick all budget intel cpu to death.... Poor i3 celeron and pentium rest in peace devil.gif


oh and with mantle bf4 im at 60-120 fps ultra biggrin.gif 64 map full
Edited by bonami2 - 3/27/14 at 6:31am
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