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Thread: SFX: Silverstonetek SX700-PT, any guess how it will compare with SF600?

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    Jon I believe you need a powenetics setup

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    The SX700-PT isn't coming out anytime soon. So SF600 is probably still your only choice right now if you want a standard SFX PSU with the highest threshold of fan off operation. Though Cybenetics is showing Corsair's upcoming SF450 Platinum and SF600 Platinum to have even higher threshold at around 180W, so you can probably wait for those too.

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    Quote Originally Posted by cmmcmm View Post
    jonnyGURU, wait I don't understand how to read this graph, are you seeing a spike of 51.0A * 12V = 612W total supply to a computer with a Vega 64 in it?
    Actually, a 65A spike.

    Even then, the spike is fast enough to not trip OPP on a 600W PSU, nor do I believe it would cause any damage (if a good PSU is used). But it is enough of a spike to trip OCP.

    That's what I was trying to capture here. We were seeing Vega 64 cards latch off PSUs with multiple +12V rails; even those with OCP as high as 40A per rail. So we had to scope it to see exactly why.

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    Quote Originally Posted by jonnyGURU View Post
    So we had to scope it to see exactly why.
    What oscilloscope are you using? I am used to using scopes that only measure voltage.

    Of course one might say just measure the voltage across a resistor and deduce the current, but at high frequencies one must then take care to use a low inductance resistor, i.e. one that is properly counter wound.

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    Nothing special about the oscilloscope. There's a Techtronix TCPA300 current probe plugged into it to measure the current.

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    Quote Originally Posted by jonnyGURU View Post
    Nothing special about the oscilloscope. There's a Techtronix TCPA300 current probe plugged into it to measure the current.
    Do you know the specs on the current probe? does it have a frequency limit?

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    Quote Originally Posted by ashiekh View Post
    Do you know the specs on the current probe? does it have a frequency limit?
    http://bfy.tw/JI8I


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    100 MHz

    and you seem to be far below this

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    Quote Originally Posted by jonnyGURU View Post
    Actually, a 65A spike.

    Even then, the spike is fast enough to not trip OPP on a 600W PSU, nor do I believe it would cause any damage (if a good PSU is used). But it is enough of a spike to trip OCP.

    That's what I was trying to capture here. We were seeing Vega 64 cards latch off PSUs with multiple +12V rails; even those with OCP as high as 40A per rail. So we had to scope it to see exactly why.
    If I understood it right, these high spikes are not common among GPU:s but it's a Vega 64-specific thing.

    Are AMD incompetent, any guesses as to why they shipped Vega64 with this "feature"?

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    Would be nice to up the decoupling capacitors and see what effect that has.

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