News Nvidia RTX 5090 beats RTX Pro 6000 in tests after shunt mod to a staggering 800W — consumer flagship barely scrapes past the $10,000 Pro despite ey...

[Admin]

An Asus ROG Astral LC RTX 5090 has been shunt modded, resulting in its performance eclipsing the $10,000 RTX Pro 6000

Nvidia RTX 5090 beats RTX Pro 6000 in tests after shunt mod to a staggering 800W — consumer flagship barely scrapes past the $10,000 Pro despite ey... : Read more

 

[TheyStoppedit]

I'd like to see what the connector looked like after that was all done.... Lol

 

[edzieba]

I'd like to see what the connector looked like after that was all done.... Lol

Perfectly fine, as long as it remained properly seated. Micro-fit+ connectors support 10.5A per pin continuous load at 125°C (126W per pin at 12v, or a hair under 800W per 12-pin connector), so with the 75W from the card-edge power rail 800W remains - barely - within spec. With some active cooling (i.e. point a fan at it) higher powers should be reasonable for short periods such as benchmarking runs, since the -Fit connector line tend to be overspecced.

The issue comes when the connector is not fully seated and some of the pins do not make proper contact, and thus increase resistance (which leads to heating, which leads to more resistance, and in the worst case thermal runaway). Regular Mini-Fit Jr. (AKA 'PCIe power') connectors can suffer from the same, but since they generally have fewer pins they are more difficult to misalign, though a quick google for "melted PCIe 6-pin" or "melted PCIe 8-pin" will turn up plenty of examples.

 

[borthe]

I did a shunt mod on a 2080ti a few years ago that worked out great. It was the first time I ever tried soldering a pcb too. The card was watercooled and I used it for about a year after without any problems until I sold it. Probably won't be trying that again though.

 

[thestryker]

Perfectly fine, as long as it remained properly seated. Micro-fit+ connectors support 10.5A per pin continuous load at 125°C (126W per pin at 12v, or a hair under 800W per 12-pin connector), so with the 75W from the card-edge power rail 800W remains - barely - within spec. With some active cooling (i.e. point a fan at it) higher powers should be reasonable for short periods such as benchmarking runs, since the -Fit connector line tend to be overspecced.

If you watched the video you'd know the power wasn't balanced and two pins were carrying notably less than the rest. While I'm sure the connector was fine likely wouldn't be long term. At least with the Astral card there's per pin measurements so that can be monitored and dealt with.

 

[alceryes]

...The issue comes when the connector is not fully seated...

This statement has been demonstrated to be false.
Even with a fully seated 12V-2x6 connector, there can be large differences in individual pin contact area, resistences, and heat production.
If the 12VHPWR (and 12V-2x6) standard had the same safety margins that the OG 8-pin connectors had, we wouldn't be having this conversation and those hundreds (thousands?) of people who have lost GPUs due to a faulty design, would still have happy, working GPUs.

 

[_D_D]

Perfectly fine, as long as it remained properly seated. Micro-fit+ connectors support 10.5A per pin continuous load at 125°C (126W per pin at 12v, or a hair under 800W per 12-pin connector), so with the 75W from the card-edge power rail 800W remains - barely - within spec.

Specs I've seen are 9.2A max for a maximum 30C rise in temperature. Connector last I looked was rated for 105C but maybe that has changed? Also 12V IIRC allows for -8% tolerance so very slightly over 600W on a unlikely perfectly balanced supply.

 

[King_V]

I feel like I'm taking the easy laugh here, but: