- Oct 10, 2005
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I'll start with my expectations for how the block should perform are based on my experience having a 6900XT reference card with an EK Quantum block for a while, where at normal overclock loads (340-360W) it would see mid 40's for edge temp and around 10C delta to hotspot, around mid 50's.
I've been waiting for a block to come out for the 6900XT Strix that I got, and since Phanteks was first to market and seem to be a reputable brand, I ordered it as soon as I learned about it.
I installed it last night, and noticed two things - there is a deep (for what is supposed to be flat) machining line that runs across the coldplate and also the heights of the screw standoffs don't seem to be consistent, so the card is bowed out at the die.
Nonetheless, the mounting looked good and all the thermal pads make contact so I installed it into my loop.
Sadly, upon testing it, I see edge temps that are somewhat in line with the old EK block at similar thermal loads, but a little higher. I'd probably be OK with that if the delta to hotspot was still around 10C....
But it's not. Hotspot regularly runs 20-30C hotter than edge. The highest delta I observed was 36C! It really makes me think that machining line is preventing the die from making good contact along it, or the uneven standoff height causing it to bow out is lightening the mounting pressure in places.
I plan to reach out to Phanteks, and also take the block out this weekend and dismount it to get a look at what might be the culprit.
Am I making a mountain out of a molehill? Is it too much to ask for a Phanteks block, which costs the same as an EK block, to perform similarly and have similarly good die mount/coldplate flatness?
Sample 360W load comparison
EK: 45C edge/55C Hotspot
Phanteks: 48C edge/72C hotspot
If I run the card to the ragged edge with a 470W load, edge is 57C and hotspot is 93C! The fact the hotspot delta grows with increasing load really makes me wonder.
In the same loop, similar ambient, similar coolant temps.
I've been waiting for a block to come out for the 6900XT Strix that I got, and since Phanteks was first to market and seem to be a reputable brand, I ordered it as soon as I learned about it.
I installed it last night, and noticed two things - there is a deep (for what is supposed to be flat) machining line that runs across the coldplate and also the heights of the screw standoffs don't seem to be consistent, so the card is bowed out at the die.
Nonetheless, the mounting looked good and all the thermal pads make contact so I installed it into my loop.
Sadly, upon testing it, I see edge temps that are somewhat in line with the old EK block at similar thermal loads, but a little higher. I'd probably be OK with that if the delta to hotspot was still around 10C....
But it's not. Hotspot regularly runs 20-30C hotter than edge. The highest delta I observed was 36C! It really makes me think that machining line is preventing the die from making good contact along it, or the uneven standoff height causing it to bow out is lightening the mounting pressure in places.
I plan to reach out to Phanteks, and also take the block out this weekend and dismount it to get a look at what might be the culprit.
Am I making a mountain out of a molehill? Is it too much to ask for a Phanteks block, which costs the same as an EK block, to perform similarly and have similarly good die mount/coldplate flatness?
Sample 360W load comparison
EK: 45C edge/55C Hotspot
Phanteks: 48C edge/72C hotspot
If I run the card to the ragged edge with a 470W load, edge is 57C and hotspot is 93C! The fact the hotspot delta grows with increasing load really makes me wonder.
In the same loop, similar ambient, similar coolant temps.