How is that possible? Even if the chip did not get enough cooling it should have been just throttled heavily.
Maybe the throttling circuitry/firmware simply doesn't have enough time to react.
GMP damaging Zen 5 CPUs?
31–40 of 240 posts
Re: GMP damaging Zen 5 CPUs?
#32What is gmp?
From https://gmplib.org/#WHAT
> What is GMP?
> The GNU Multiple Precision Arithmetic Library
> GMP is a free library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers. There is no practical limit to the precision except the ones implied by the available memory in the machine GMP runs on. GMP has a rich set of functions, and the functions have a regular interface.
Many languages use it to implement long integers. Under the hood, they just call GMP.
IIUC the problem is related to the test suit, that is probably very handy if you ever want to fry an egg on top of your micro.
Re: GMP damaging Zen 5 CPUs?
#33No actual die temperature measurements? That would seem a lot more relevant than the ambient temperature.
Re: GMP damaging Zen 5 CPUs?
#34What is gmp?
At first I thought it was Green Mountain Power ;)
Re: GMP damaging Zen 5 CPUs?
#35Enthusiast-oriented motherboards often default enable Precision Boost Overdrive, causing higher power and temperature limits for longer periods. To run the CPU at “stock” you need to go in and disable that. Their default Load Line Calibration might be aggressive as well.
Re: GMP damaging Zen 5 CPUs?
#36Earlier quoted context omitted.
People without a background in electronics don't appreciate what modern CPUs and GPUs are doing: the amount of current flowing through these devices is just mind blowing. With adequate cooling, a Ryzen 9 9950X is handling somewhere in the neighborhood of 150-200 amps under high load.
I initially scoffed at the 150-200 amps. But I know core voltage is usually in the neighbourhood of 1V so to draw 200W, you really would have to basically be moving 200A of current. That's wild.
Yup. P=IV is really surprising when you get to high power parts at low core voltages. Needless to say, you need lots of transistors and phases on voltage conversion, and you need lots and lots of plane area.
(And,... 200A is the average when dissipating 200W. So how high are the switching currents? ;)
Re: GMP damaging Zen 5 CPUs?
#37Looking at the AM5 pinout[0], it looks like those pins are VDDCR and VSS. There might be a little bit of PCIe sprinkled in towards the outer edges, but I'm not 100% on the orientation of this pinout vs the orientation of the CPU. I don't know anything about electricity so I've got nothing else to add. [0] https://upload.wikimedia.org/wikipedia/commons/2/2d/Socket_A...
This is a nice guess but the likelihood that actual silicon area is closely connected to the pins in that area is not so obvious
Re: GMP damaging Zen 5 CPUs?
#38Earlier quoted context omitted.
He's a bit sensationalist, yes, but I am thankful that he saved us from buying affected Intel CPUs.
GN wasn't the first to break the story the 13/14th gen was defective. The thousands and thousands of users experiencing the issues collectively noticed pretty quick. If anything, there was a period where he was saying "We've talked to Intel but we won't say anything yet until they do."
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Re: GMP damaging Zen 5 CPUs?
#39Earlier quoted context omitted.
People without a background in electronics don't appreciate what modern CPUs and GPUs are doing: the amount of current flowing through these devices is just mind blowing. With adequate cooling, a Ryzen 9 9950X is handling somewhere in the neighborhood of 150-200 amps under high load.
I initially scoffed at the 150-200 amps. But I know core voltage is usually in the neighbourhood of 1V so to draw 200W, you really would have to basically be moving 200A of current. That's wild.
AMD's desktop CPUs are still running at a bit more than 1V; 1.3-1.4V is what you'll see at the high end of the clock speed range. But power draw can easily be in the 250–300W range if you turn on the "PBO" automatic overclocking mode, so 200A is not really the upper bound.
Re: GMP damaging Zen 5 CPUs?
#40One day I’ll understand why some websites refuse to have a way of navigating to the home page. I had to edit the URL in the address bar.
I just wanted to find out what GMP is.