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Can I demo an RTX 4090 with older Modular 2008 Silverstone ST1200 power supply?

T

Tanquen

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This did work in my setup but I am limited to 450 watts. I'm not sure how much of a difference that makes performance wise but I was just wanting to show that the guard worked.

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I got a 5090 like 4 months ago and I've been super lazy about cleaning up the 4090 and getting ready to sell.

It's difficult to find info on the Silverstone ST 1200 Gen 1. It does have many 8PIN sockets dedicated to two full 8PIN PCI-E cables. It also has two 8PIN sockets that are dedicated to two 6PIN PCI-E cables.

I see there are 6PIN to 8PIN adapters and the 6PIN will fit into 6 pins of a 8PIN socket on the Nvidia 4x8PIN to 12 pin adapter.

I've seen some info online showing folks running an 4090 with three 8 pin connectors being limited to 450 watts. Theoretically two 8PIN and two 6PIN would also get me two 450 Watts.

I'd hate to buy another power supply just so I can demo the 4090 when somebody comes to look at it.

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You should be OK, just make sure you're spreading the load out across multiple strings and all the plugs going into the adapter are well seated.

The only real hazard is that 2:1 and 3:1 adapters to merge up low draw connections into a high draw one rely on passive load balancing (as does the GPU itself balancing load across it's power pins). Passive balancing just applies the load to everything collectively and lets the current flow as it will. If resistive loads are all equal so will the current be. If one of the connections is bad it'll have a much higher resistance and lower power draw as a result; meaning you'll be pulling more from the other ones instead.

Also, unless the card doesn't use slot power at all you should have 515/525 watts of power available without overdrawing anything. An x16 slot is specced to deliver 65W of 12V power and 10W of 3.3V (same as a legacy parallel PCI card).
 
Tanquen said:
the 6PIN will fit into 6 pins of a 8PIN socket on the Nvidia 4x8PIN to 12 pin adapter.
Click to expand...

Yeah, you can just do this, especially if they are modular cables and all coming from the same source anyway. The only difference between a 6-pin and 8-pin cable is 2 extra ground wires. The actual wires that carry power are the same.

Main thing is:
Use 4 individual cables from your PSU to the Nvidia adapter. Don't use two PCIe power connectors on the same PCIe power cable. Don't use any splitters.
Check to see if your PSU is single-rail or multi-rail. If it's single-rail, then it shouldn't matter. If it's multi-rail, then you need to make sure that you are using PCIe power cables that are spread evenly across the available rails.
 
Thanks for the info.
It will be four separate cables, coming from four separate sockets on the 1200 Watt power supply.

1775935262344.png
 
why not just put it in place of your 5090? just set it to the side, dont take out the rad.
 
pendragon1 said:
why not just put it in place of your 5090? just set it to the side, dont take out the rad.
Click to expand...
The 5090 is an all in one and I'd have to get it out of the way which would be somewhat difficult.

Then install the 4090 that is a custom loop with water block. I don't think there's room to put it in there the original air cooler on the card.

It would just be way easier to set it up with a rad and pump outside my old computer and plug it all in and leave it that way until somebody agrees to come and look at it and agrees to buy it versus tearing down my primary work station multiple times.
 
Tanquen said:
So there's no real reason for the 6PIN to 8PIN adapter? I have a second one somewhere but I can't find it.

View attachment 796550
Click to expand...

All it's doing is doubling up the ground wires. Those adapters have their purpose, if those other pins really needed to be grounded. If you were attaching the output of that 6-to-8 pin adapter directly to a card, then I'd say use the adapter. In the context of feeding a NVidia 12-pin adapter, I don't think it matters.
 
Tanquen said:
The 5090 is an all in one and I'd have to get it out of the way which would be somewhat difficult.

Then install the 4090 that is a custom loop with water block. I don't think there's room to put it in there the original air cooler on the card.

It would just be way easier to set it up with a rad and pump outside my old computer and plug it all in and leave it that way until somebody agrees to come and look at it and agrees to buy it versus tearing down my primary work station multiple times.
Click to expand...
No one going to buy a card with the block. Put the stock cooler back on it and I bet it is both easier to demo and sell
 
tunatime said:
No one going to buy a card with the block. Put the stock cooler back on it and I bet it is both easier to demo and sell
Click to expand...
But it's so nice and clean now:
1776468775261.png

Most likely it would be easier to sell just the card but then I'd be stuck with the water block and radiators for some time but I should be able to sell them. Someone's buying them just not as many. I waited forever for 5090 with a water block and gave up and got an all in one. The few companies making one with a water block were permanently sold out or $4000 or $5000 on eBay.
The main issue now is with the stock cooler, it wouldn't fit in the only PC I have available to demo it. So I'd have to pull everything out of the case to demo it I'd rather not do that either.

Last year there were a handful of 4090s moving in the for sale forum here on the site but there hasn't been anything in a while.
 
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I'd buy the card with the water block installed as my main rig already has a water block installed on it's gpu.
 
Some people would be interested, but the market for custom loop water cooled cards is far smaller than the overall market. It's even smaller for prior generation used cards.
 
Finally got the RADs, pump and block cleand up and ready to demo.

Is Furmark a good enough test to convince somebody the card is working properly?

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Tanquen said:
Finally got the RADs, pump and block cleand up and ready to demo.

Is Furmark a good enough test to convince somebody the card is working properly?

View attachment 799112
Click to expand...
That's up to whoever you sell it to. Best bet is to keep the rig together till you sell it that way you could demo it live /that day via pm or whatever to whoever is interested.

Should probably should run some new games with rt ECT as 4k furmark is old school and doesn't load the card up like new games do and I personally would want to see it running some triple aa games to test vram and rt cores.
 
tunatime said:
That's up to whoever you sell it to. Best bet is to keep the rig together till you sell it that way you could demo it live /that day via pm or whatever to whoever is interested.

Should probably should run some new games with rt ECT as 4k furmark is old school and doesn't load the card up like new games do and I personally would want to see it running some triple aa games to test vram and rt cores.
Click to expand...
I don't know it says it's using 100% of the GPU and it gets really hot really fast. More so than any other triple A game I play.
Those triple 360 rads got to like 120°F super quick. I'm actually going to have to put a spacer and some fans on them. It took like 15 minutes but I thought three of the radiators would, radiate the heat quickly enough without fans. Nope.
 
The old desktop I'm using has an Intel i7 3930K and apparently it's missing a newer version of an instruction set that a lot of the new triple A games like Pragmata and Indiana Jones in the great circle need. With the slower CPU and RAM on the older system wouldn't really do any games justice.
 
Tanquen said:
I don't know it says it's using 100% of the GPU and it gets really hot really fast. More so than any other triple A game I play.
Those triple 360 rads got to like 120°F super quick. I'm actually going to have to put a spacer and some fans on them. It took like 15 minutes but I thought three of the radiators would, radiate the heat quickly enough without fans. Nope.
Click to expand...
It will definitely get too hot set up like that. Sitting it up with a desk fan pushing some air would be much better than how it is sitting flat.
I used a Koolance ERM-2K3U system to demo because it was easy to set up and take down and far cheaper than a Koldwave. It was a customer return from 2011. I still have it and it comes in handy to test GPUs like yours and other things I run into that need water cooling that's semi portable.

erm-2k3u_p1-375x375.jpg
 
I just added three fans and it made a night and day difference now the temperature basically doesn't go up. I didn't do the math and not something I really thought about I just thought three huge radiators pouring heat into the room would be enough. I was completely and totally wrong.

Now I just need to put an ad together and get ready to deal with "people". :(

Nobody's list any 5090s or 4090s here in a while. Are people really getting over two grand for a used 4090 in good condition?

1777221093277.png
 
Tanquen said:
I don't know it says it's using 100% of the GPU and it gets really hot really fast. More so than any other triple A game I play.
Those triple 360 rads got to like 120°F super quick. I'm actually going to have to put a spacer and some fans on them. It took like 15 minutes but I thought three of the radiators would, radiate the heat quickly enough without fans. Nope.
Click to expand...
I don't believe it hits the ai cores?
 
tunatime said:
I don't believe it hits the ai cores?
Click to expand...
On top of everything else the older i7 3930k CPU is not supported by newer games like Pragmata. I was able to get Space Marines 2 and Cyber Cyberpunk 2077 up and running but the slower CPU and RAM is not doing it any favors but you can see that it works.

I just listed it and we'll see how it goes. With all the shenanigans lately with higher end cards it's got me a little stressed.
 
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that gap for air flow is probably the more important part. idk why youre going trough so much effort though. you only need to let it run for a couple minutes to show em or better yet, take a vid and then no need for "demos".
 
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