Powered Riser for use with Iray?
Diaspora
Posts: 440
https://www.newegg.com/p/1W7-005X-00095?Description=powered riser&cm_re=powered_riser-_-1W7-005X-00095-_-Product&quicklink=true
So, I'm gonna try to get a 4090 as soon as I can and demote my 3090 to 'iray helper'. The problem is there is no way my case can accomodate a 3090 and a 4090 and what cryptominers sometimes do is mount the gpu externally using powered risers (and at this time I don't want to go the length and expense of getting a super large case).
Since I won't be using the 3090 for extremely high bandwidth operations like real time rendering/gaming/VR but JUST Iray, I have to ask, has anyone else tried this or done this?
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https://www.daz3d.com/forums/discussion/341681/using-a-crypto-mining-rig-for-iray
Ok ok... looks like it can be done. I guess in a couple months or whenever everything is in place for me to do this, I'll report back on how this played out.
this could be a solution for my Win7 PC where I damaged both reachable PCEi lanes and cannot mount any card
I have one I need to move the PSU to fit one still and will take it to the shop one day to see if they can
Been doing this since i started using iray, back in...too bloody long ago, lol.
There are two things you'll run into, beside a minor(might be bigger with a 30 series compared to my old junk tesla's) performance hit.
The first, power delivery.
3090's tdp is 350W(or higher depending on manufacturer), 4090 is 450W. total, 800W
Any transients and you could easily hit 1600W, plus the rest of your system.
There are some monster(2000W and above) rated powersupplies, but....you may need to rewire the outlet circuit you'll be using.
Most home outlets are rated to 1800W(120V@15 amps), and entire rooms, if not entire floors can be on one 15amp breaker.
I'd suggest checking the wiring in your home to see if you'll need an upgrade here.
Also, check with your city about whether you'll need an electrician to do the work or not.
I'd recommend a second powersupply for the secondary gpu. It'll put less of a strain on your primary, as well as allowing you to plug into a second circuit, if available or necessary.
You can either go with a standard atx, and get a 'splitter' to connect the two, or use a paper clip to jump the green and black wires.
Or get a used server PSU and a breakout board, preferably one with pci-e(6pin to 6/8pin) power cables included. You'll need 3-4 cables depending on which variant of the 3090 you have.
The other part, something to mount the adapter to, unless you want your gpu falling over continuously.
Block of wood wide enough to provide anti tipping support is just fine.
Do you need a 4000 series card? The power requirements seem insane not to mention it is going to be heavy as hell and use at least 3 slots of space on your PC and a retainer braket. These cards are rumored to have a MSRP of $1600 so this means the prices will be around $2000 to $2500 us dollars after markup! My two slot 3090 that cost me $1000 before the bitcoin madness is looking better and better. If I do get a 4090 It will have to be a water cooled 2 slot edition that is under $1500. It will also have to fart rainbows and bring world peace because my 3090 works too well for me to trade up.
Unless you live in an apartment, generally the electric codes limit 1 15 amp circuit to a single room. Each room usually requires its own circuit. Now there ARE power combiner extension cords that are rated at 50 amps but the female end tends to be the type you see for stoves and laundry dryers and they are also short. There ARE adapters for that which turn the female ports into regular power ports but not sure what amperage they support and how safe it would be. I also wouldn't expect 1800W since the average volatge that actually comes out of wall sockets is around 110, not a true 120, so 1650 true Watts.
That's my plan! I had a 650 watt power supply left over after I upgraded that I thought about selling but didn't figure was worth my time and trouble to sell, now that the 4090 is coming out I'm glad I didn't.
I don't believe that's gonna happen, because of Crypto Winter GPU prices have absolutely crashed.
Gonna have to point to some actual code on that, cause the NEC(National electrical code) has no such limitation that i could find, nor have i been able to find any such requirement on a state level.
Also, the 'actual' wall voltage depends on your electric company.
Mine is 120V when checked by VoM(volt ohm meter).
That's why i suggesting checking his wiring first.
Test and make sure, don't just 'assume'.
Might be pushing it a little bit.
Check the 12v rail to make sure it can deliver most if not all of the power to it.
Just be prepared to replace it for a higher wattage if you start having system crashes due to OPP(over power protection) trips.
I went to 1200's because the 750's i had kept tripping.