toddryoungblood
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Does this work? I'm trying to test this, but I'm getting really strange results. My motherboard is supposed to support 2 slots @ x16, 1 slot @ x4. I'm limited to 750W from my PSU and I don't want to push it, so I'm trying to fold with a 670 over a riser on (what's supposed to be an x4 slot) an x1 slot and my 1080 Ti on an x16, instead of running an 670, 1070, and 1080 Ti. It seems like it's working over x1, but I want to make sure it's not going to bottleneck the PPD. There is no way the 670 is doing 1.17M (dropped to 220k after a while, which is still too high).  Has anyone tried to fold on a mobo that supports multiple x1 slots over a riser? Does it cap PPD due to bandwidth? I'm getting another 1080 Ti in the next few days and I'm trying to decide whether or not to get another PSU so I can support 3x cards off this mobo.
post edited by toddryoungblood - 2017/03/26 14:31:39
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Chris21010
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Re: Folding on PCIe x1 Slot
2017/03/26 15:26:38
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you will need at least a pcie 2.0 x16 or pcie 3.0 x8 to prevent bottlenecks. a pcie x1 slot will most definitely reduce PPD from the card on it but as to how much i can not say.
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bcavnaugh
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Re: Folding on PCIe x1 Slot
2017/03/26 16:13:56
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☄ Helpfulby toddryoungblood 2017/03/26 16:21:39
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toddryoungblood
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Re: Folding on PCIe x1 Slot
2017/03/26 16:20:59
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I misread the riser I ordered. The "x1 to x16" doesn't mean it scales from x1 to x16, it means one end is x1 and the other is x16.  If anyone was wondering, running a 1070 on x1 outputs 420k PPD. It's roughly a 25% decrease over max.
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bcavnaugh
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Re: Folding on PCIe x1 Slot
2017/03/26 16:26:07
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You will need a Self Powered Riser if you even try this. I did give a Riser a shot but could only get it to run at x4 and very unstable. The older GPUs also need more Power then today GPUs.
post edited by bcavnaugh - 2017/03/26 16:28:54
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toddryoungblood
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Re: Folding on PCIe x1 Slot
2017/03/26 16:31:28
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bcavnaugh
You will need a Self Powered Riser if you even try this.
I did give a Riser a shot but could only get it to run at x4 and very unstable.
The older GPUs also need more Power then today GPUs.
The one I purchased was powered off SATA. https://www.amazon.com/gp..._s00?ie=UTF8&psc=1
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bcavnaugh
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Re: Folding on PCIe x1 Slot
2017/03/26 16:41:44
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Link Keep us Posted on the Outcome.
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toddryoungblood
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Re: Folding on PCIe x1 Slot
2017/03/26 16:44:47
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I went out and got another PSU to power one of the graphics cards independently, but it didn't work. Looks like I'm going to need a bigger PSU in order to run all 3 cards.
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bcavnaugh
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Re: Folding on PCIe x1 Slot
2017/03/26 18:11:19
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Watch your Circuit Breaker for overheating.
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toddryoungblood
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Re: Folding on PCIe x1 Slot
2017/03/27 04:48:59
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bcavnaugh
Watch your Circuit Breaker for overheating.
I'm keeping it below the 15A/1800W limit from the wall outlet.
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Opolis
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Re: Folding on PCIe x1 Slot
2017/03/27 08:26:40
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toddryoungblood
bcavnaugh
You will need a Self Powered Riser if you even try this.
I did give a Riser a shot but could only get it to run at x4 and very unstable.
The older GPUs also need more Power then today GPUs.
The one I purchased was powered off SATA.
https://www.amazon.com/gp..._s00?ie=UTF8&psc=1
I have used a riser just like this one for years with no problems folding or crunching. It went into a x16 slot.
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Chris21010
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Re: Folding on PCIe x1 Slot
2017/04/11 18:27:20
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☄ Helpfulby toddryoungblood 2017/04/12 06:12:15
i feel this is a reasonable place to put this as i do not want to make a new thread about pcie performance. but, after about two weeks i have come to a conclusion. the performance loss going from pcie 3.0 x8 down to pcie 2.0 x8 is negligible at about 8%. this conclusion comes after completing over 550 work units over a two week period, results can be viewed here. i did this testing by folding a week on pcie 3.0 x8, my personal 5x 1070 GPU machine, and then set my bios to Gen 2 on the PCI bus settings and folded for another week. after that i parced the F@H log files using the time the work unit was downloaded as a starting time and the time the unit was finished as its finished time. i then took the estimated points given and got that units PPD. repeat this over 558 units, excluding faulty ones, and got their avg, median, min, and max then compared the two. now i just wish i could have the same amount of data to compare pcie 3.0 x16 to pcie 2.0 x16 or even pcie 3.0 x16 down to pcie 3.0 x8.
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ipkha
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Re: Folding on PCIe x1 Slot
2017/04/12 03:50:09
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Chris21010
i feel this is a reasonable place to put this as i do not want to make a new thread about pcie performance. but, after about two weeks i have come to a conclusion. the performance loss going from pcie 3.0 x8 down to pcie 2.0 x8 is negligible at about 8%. this conclusion comes after completing over 550 work units over a two week period, results can be viewed here.
i did this testing by folding a week on pcie 3.0 x8, my personal 5x 1070 GPU machine, and then set my bios to Gen 2 on the PCI bus settings and folded for another week. after that i parced the F@H log files using the time the work unit was downloaded as a starting time and the time the unit was finished as its finished time. i then took the estimated points given and got that units PPD. repeat this over 558 units, excluding faulty ones, and got their avg, median, min, and max then compared the two.
now i just wish i could have the same amount of data to compare pcie 3.0 x16 to pcie 2.0 x16 or even pcie 3.0 x16 down to pcie 3.0 x8.
Pcie 2.0 x16 is equivalent to pcie 3.0 x8. Pcie 3.0 uses different encoding to double bandwidth per lane vs 2.0. I doubt 3.0 x16 makes a difference for a 1070 since for theoretical 1/2 bandwidth only generated an 8% drop.
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Chris21010
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Re: Folding on PCIe x1 Slot
2017/04/12 06:08:19
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ipkha
Pcie 2.0 x16 is equivalent to pcie 3.0 x8.
Pcie 3.0 uses different encoding to double bandwidth per lane vs 2.0.
I doubt 3.0 x16 makes a difference for a 1070 since for theoretical 1/2 bandwidth only generated an 8% drop.
that is a very logical answer and one i too believed, but the reality is that just isnt the case. my buss usage on pcie 3.0 x8 was 45-50% very consistently. so one would assume half the bandwidth double the usage, right? well no its only 60% usage and very consistently 60% usage. this makes no logical sense to me as to why its so low and i only have an 8% performance loss when theoretically bandwidth to the CPU was cut nearly 40%.
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nathan_P
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Re: Folding on PCIe x1 Slot
2017/04/12 07:31:53
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In my much more limited tests I found very little difference between 3.0 x16, 3.0 x8 and 2.0 x16, maybe 1-2%, there was another 2-3% drop on average to PCIe 1.1 x16 but there were some WU affected more than others and I did see a couple of 8-10% drops.
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Chris21010
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Re: Folding on PCIe x1 Slot
2017/04/12 07:46:31
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nathan_P
In my much more limited tests I found very little difference between 3.0 x16, 3.0 x8 and 2.0 x16, maybe 1-2%, there was another 2-3% drop on average to PCIe 1.1 x16 but there were some WU affected more than others and I did see a couple of 8-10% drops.
yes you can see from the min/max i posted that they dropped by nearly 30% and 20% respectively. so there are most definitely some units that are hindered more than others.
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ipkha
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Re: Folding on PCIe x1 Slot
2017/04/12 13:45:00
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There can be some latency issues with data encoding schemes and location of the data requested. The data still has to be transmitted through the CPU so there is some variability.
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Chris21010
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Re: Folding on PCIe x1 Slot
2017/04/12 13:48:04
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that too makes sence if hardware was different but the hardware was identical. all i did was set a software limitation in the BOIS to use pcie Gen2 standards instead of the defaulted Gen3.
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ipkha
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Re: Folding on PCIe x1 Slot
2017/04/12 14:03:19
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Chris21010
that too makes sence if hardware was different but the hardware was identical. all i did was set a software limitation in the BOIS to use pcie Gen2 standards instead of the defaulted Gen3.
That's what I'm talking about. 2.0 and 3.0 use different encoding schemes to send requests and data. So 3.0 is not running at double the clockspeed of 2.0. Also, there is some constant traffic that has to happen. Good testing nonetheless. Did you happen to run any synthetic benchmarks?
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Chris21010
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Re: Folding on PCIe x1 Slot
2017/04/12 14:13:11
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no... but i can when i get home. i know it will be bad in comparison because while folding my frame rate dropped from ~20-30 to 3-5fps when i lowered the buss speed.
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Chris21010
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Re: Folding on PCIe x1 Slot
2017/04/12 15:56:29
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