Powered risers or not? | Bitcointalksearch.org

Takeshi_Kovacs

member

Activity: 65

Merit: 10

Quote from: stefffe on August 07, 2013, 08:53:35 AM

Quote from: Boxman90 on August 06, 2013, 09:17:39 AM

Only if the motherboard you're using doesn't have extra power (molex) near the PCI slots on the baord itself.

The risk is then burning out some pins on the ATX connector. If you have the extra power @ the slots, you're in the clear.

Well ok. But the motherboard clearly says it is capable of 4x gfx cards and the psu (1200w) have like 10 x pcie power cables ??! I dont get what powered risers does rly...Can someone explain a bit deeper?

A graphics card takes power from the on card power connectors for the GPU. It takes power for the on-board video RAM from the PCI-E bus connection.

That is fine for games and for Bitcoin mining but not so good for Litecoin and other scrypt based alt-coins. Scrypt mining hits the graphics card RAM with a much higher load than gaming or Bitcoin mining. Without powered risers, you will be drawing more current from the motherboard than would be the case for most uses of graphics cards. That is when you can get into trouble if you do not have powered risers.

ur0pl

newbie

Activity: 56

Merit: 0

Quote from: superresistant on August 20, 2013, 01:25:20 AM

Quote from: ur0pl on August 19, 2013, 04:03:49 PM

You should used powered risers regardless of how many video cards you are using. You could safely run 2-3 cards without powered risers. I made the mistake of not using powered risers because other people said I could run five gpus without them. Well, my mother board had a molex connection for pci-e slots and I had ocz gold psu. well, my cable for my psu burnt out, and somewhere along the line i had to send back my gpu for a replacement.

Use powered risers if you want to power more than 2 or 3 three cards. Do not listen to those who say you do not need them. You could probably get them for around 8-12 each. Or even 6 if you get them directly from China.

Yes you can run 5 GPU without them but it depend of what GPU model. It also depend of the motherboad you use.

I have 10x 6770 but each consume about 90W (undervolted). If you try 5x 7990 ofc it's gonna burn Roll Eyes

I tried 5x 7950. even 4 made it burn

superresistant

legendary

Activity: 2156

Merit: 1131

Quote from: ur0pl on August 19, 2013, 04:03:49 PM

You should used powered risers regardless of how many video cards you are using. You could safely run 2-3 cards without powered risers. I made the mistake of not using powered risers because other people said I could run five gpus without them. Well, my mother board had a molex connection for pci-e slots and I had ocz gold psu. well, my cable for my psu burnt out, and somewhere along the line i had to send back my gpu for a replacement.

Use powered risers if you want to power more than 2 or 3 three cards. Do not listen to those who say you do not need them. You could probably get them for around 8-12 each. Or even 6 if you get them directly from China.

Yes you can run 5 GPU without them but it depend of what GPU model. It also depend of the motherboad you use.

I have 10x 6770 but each consume about 90W (undervolted). If you try 5x 7990 ofc it's gonna burn Roll Eyes

ur0pl

newbie

Activity: 56

Merit: 0

You should used powered risers regardless of how many video cards you are using. You could safely run 2-3 cards without powered risers. I made the mistake of not using powered risers because other people said I could run five gpus without them. Well, my mother board had a molex connection for pci-e slots and I had ocz gold psu. well, my cable for my psu burnt out, and somewhere along the line i had to send back my gpu for a replacement.

Use powered risers if you want to power more than 2 or 3 three cards. Do not listen to those who say you do not need them. You could probably get them for around 8-12 each. Or even 6 if you get them directly from China.

Damnsammit

sr. member

Activity: 406

Merit: 250

Quote from: CartmanSPC on August 19, 2013, 02:28:30 PM

Quote from: Damnsammit on August 19, 2013, 02:01:09 PM

Do powered risers work if you just don't plug the molex in?

Mine did. Asked the supplier before I did and they said plugging them in was optional.

Cool. Thanks for that info! I am still anxious about getting all these video cards working without having to use a 2nd PSU.

Everyone says 850W should be fine but I am running out of plugs and all the adaptors I am trying are not working!

CartmanSPC

legendary

Activity: 1270

Merit: 1000

Quote from: Damnsammit on August 19, 2013, 02:01:09 PM

Do powered risers work if you just don't plug the molex in?

Mine did. Asked the supplier before I did and they said plugging them in was optional.

Damnsammit

sr. member

Activity: 406

Merit: 250

Do powered risers work if you just don't plug the molex in?

Just curious... ordered several powered and unpowered risers but haven't had a chance to play with them yet on my milk-crate.

CartmanSPC

legendary

Activity: 1270

Merit: 1000

So are there any drawbacks to using powered risers? I ran my rig without using the powered connectors for a week and it seemed fine. I now have the powered connectors attached and can't tell a difference.

Currently using 3x7970s with a fourth coming online soon.

I have one of those Infrared Thermometers to see what the temps are like but don't know where to check. The 24 pin ATX connector?

InSpades

newbie

Activity: 23

Merit: 0

I run 5 x 7950 on a couple of my rigs with no issue. 4 non powered / 1 powered via molex. They are split between an Antec 900W and Corsair 850W PSUs. No problems with LTC mining here.

superresistant

legendary

Activity: 2156

Merit: 1131

I use PCIe1x to PCIe1x connector for my 10 GPUs.
Fuck the police.

dacman61

member

Activity: 87

Merit: 10

I got 3 for sale here:

https://www.bitmit.net/en/item/48342-pcie-x16-to-x16-extender-riser-cable-w-molex-connector

stefffe

full member

Activity: 131

Merit: 100

Okay thanks guys! I will plug my 4x7950 in today without any worries then

miter_myles

hero member

Activity: 742

Merit: 500

Quote from: WaRz0r on August 07, 2013, 10:01:33 PM

I have 4 x 7970's running on one machine with normal non powered Risers working fine...

Almost the same here.. 3x7970 and 1x7870 all on one mobo (ASRock xtreme3) non-powered risers for 1yr+ thus far.. (1050W gold PSU)

Had another rig with 7950x3 and another 7870x1 until I re-tweaked the 7950s, at that point I didnt want to abuse my 1000w gold PSU too much.. so I took the 7870 off..

WaRz0r

newbie

Activity: 13

Merit: 0

I have 4 x 7970's running on one machine with normal non powered Risers working fine...

atomriot

newbie

Activity: 55

Merit: 0

from what I understand (which i am no expert) the motherboard is capable of supplying power to pci-e cards. every high end graphics card has one or two external power connectors anyway and typically will not run if those are not plugged in, so a powered riser is not necessary.

I could see maybe in the situation that you have 2 power connectors on your card but only plug in one, and rely on the motherboard powerline from the pci-e to provide the rest, then maybe you should use powered risers but in that situation, just take more power from the power supply rather than routing it through the motherboard.

stefffe

full member

Activity: 131

Merit: 100

Quote from: Boxman90 on August 06, 2013, 09:17:39 AM

Only if the motherboard you're using doesn't have extra power (molex) near the PCI slots on the baord itself.

The risk is then burning out some pins on the ATX connector. If you have the extra power @ the slots, you're in the clear.

Well ok. But the motherboard clearly says it is capable of 4x gfx cards and the psu (1200w) have like 10 x pcie power cables ??! I dont get what powered risers does rly...Can someone explain a bit deeper?

Boxman90

hero member

Activity: 518

Merit: 500

Only if the motherboard you're using doesn't have extra power (molex) near the PCI slots on the baord itself.

The risk is then burning out some pins on the ATX connector. If you have the extra power @ the slots, you're in the clear.

Eastwind

hero member

Activity: 896

Merit: 1000

Powered riser is not essential for BTC mining. But, it is not economical to use GPU for BTC mining. It is better to mine LTC etc. So powered riser is important if you want to use more than 2 GPUs in a PC.

stefffe

full member

Activity: 131

Merit: 100

Do I really need powered risers if I got a mobo that supports 4x pcie16x?

Talking about connecting 4x 7950

Topic: Powered risers or not? (Read 6878 times)