Bitcoin Forum

[Solved] https://bitcointalk.org/index.php?topic=88793.msg1011267#msg1011267

I tested my ASRock Z75 Pro3 1155 PCIe x1 slot, it does not require short pinning of the PCIe x 1 slot, but I do not receive the correct mhash/s.

For the 5850 I am testing on with the onboard PCIe x1 slot with a PCIe x1 > PCIe x16 adapter between the two.

At default clocks on pcie x16, I receive 340 mhash/s.
Overclocked on pcie x16, I receive 368-373 mhash/s.

At default clocks on PCIe x1, I receive 290 mhash/s.
Overclocked on PCIe x1, GUIMiner shows for one second 370 mhash/s, but bumps down to 340 then down to 329 mhash/s and stays at 329 mhash/s.

Is this normal behavior for the PCIe x1 slots?

Would short pinning PCIe x1 slot bring the hash rate back up to normal?

As the operating system picked up the card, I did not want to jump the gun and apply short pinning the PCIe x1 slot.

The person that answers my questions and explain this behavior I am having with the pcie x1 slot shall receive the .1 BTC bounty. .1 BTC is all I can spare.

Windows 7 x64.
ASRock Z75 Pro3 1155.
Sapphire 5850.

Didn't realize you made a new thread. But how did you configure the graphics card after installing it on a x1 slot using your mining app?

In GUIMiner using the usual flags that I use which are  -v -w128 -f 1

Some people have reported a speed drop on x1 slots, but not as much as you are experiencing (more like a few Mh/s). You have 5850s? If so, phoenix (or phoenix2 might be better) is best to run with GUIminer I think. CGminer is the best IMO. This doesn't necessarily address your problem with the x1 slot, but it might be worth trying a different miner to see if you get the same issue. I've used phoenix/phatk, phoenix2/phatk2, and CGminer - never had this issue with any of those.

I noticed a speed drop w/ one 5970 in an X16 slot and the other on an X1 slot using power injected extension cable.
Its about 5mh/s difference between cores on my particular setup, but yes, not nearly as much as your posting.
Someone mentioned to me once the extender cable could be bad, in this maybe you should double check, try another cable.

Other than that all I can think is try a different BIOS version on the motherboard. If that doesnt change anything, verify the results in a different board if you are able too.

Not really sure what to say on this one. Only times that I've seen lower mhash for no apparent reason is on an overloaded PSU (bad/fluctuating voltage probably causes some sort of throttling on the GPU itself)

Yes, you should check that extender. If you happen to have a meter to measure resistance, one thing to check is to make sure that there aren't shorts across the pin leads on the cable. I ordered some extenders from China and about half of them had shorted leads. If you don't have a meter, you can go a long way just by inspecting the leads to make sure that none of them appear to be touching (a magnifying glass would help a lot here).

I wonder if it is because of the new Z75-Z77 Panther Point chipset. Which this board has.

I think it's a sign to just let it be. Buy a new mobo later in the future. I can't risk to try and pin short it since win7 picks it up, to see if it gains higher hash rate as I don't want to fry anything.

I can divide this .1 through the 4 of you, if you all wish.

yeah, doing the short sense trick wont help anything. Its just a sense override, if the PC detects the card the override is not needed.

.1 divided amongst the 4 of you, 3 were sent. Waiting for 4th btc address.

Thank you all for your time & generous help.

Thanks - generous since we didn't solve your problem. I know it's not much BTC, but when you haven't mined many yet, it means more. Note to self: pekv2 is a very solid member on this forum. 

I had a similar issue when i had daisy chained one 1x-1x riser cable with another 1x-16x cable. So removing one cable solved the problem for me. You can try to replace the 1x-16x riser cable with a replacement and see if it helps.

Well, everyone tried and that's what matters to me.


I just received it today from a forum member that was using it. So ionno, it could be it. I cannot do much atm so I'll have to wait it out.

4th part of donation sent out.

You're awesome dude! Thanks for donation =)
Just remember in the future with stuff like this, swap out as many components as you can and see if you get different results. If you dont then, its just how it is most likely =P, if ya do try n figure out which is the culprit.

I've seen the same on a MSI 990fx on the first 1x slot the other one works fine. Not much help I know but I'm fairly certain its not a motherboard issue, and it wasn't a faulty extension cable. So my guessing is it needs a powered extension cable or your using all the pcie lanes on the board with your other cards.

If you were using "all the other lanes" .. the card wouldnt be detected at all...

I was getting low mhash when I switch to a pci-1 slot. The problem was the pci-e extender was faulty.

Not sure if this was mentioned already. But have you tried a powered 1x - 1x extender?

Other option would be a new mobo. And now that you mention it the 1 single 1x-1x that I owned is one of the cables that I had issue with when used on 2 of my boards. But, it may be coicidence since a x1 - x16 also had an issue. same card in same slot had no issue with another x1 to x16 and a x16 to x16 so I just assumed defective extenders.

Nope, i've hadn't. I was told that I just need the x1 - x16 adapter. So I had bought one from a member here and well, the results are in the op.

Not sure i follow your results since yuo only list one connections side.

so the 1x to 16x is the one that workd correctly but a 1x to 1x did not?

I never purchased a 1x > 1x adapter, just the 1x > 16x, and that is the adapter I tested on.

Did you ever end up trying a new miner? I personally think that it's just a faulty extension (maybe shipping damage), but I would want to completely confirm my hashrate before putting more money into it. I think a new motherboard is definitely not necessary. That's an unneeded expense if you ask me.

Nah, as it the miner mines just fine with the two 5850's in the two pcie x16 slots. Yea me too, I believe the adapter might be at fault here. The adapter I've got does not look like the one on cablesaurus , it has gigabyte printed on the x16 slot of the adapter with a white pin plug but I looked at the soldering job before I used it to make sure no contacts were touching each other, they looked fine but the soldering job is for horse shit on it. Like a very cheaply made one. If I do get a new board it won't be for a while and might not at all with these new supposedly butterflylabs machines coming out.

I am going to go ahead and refund the 0.5 BTC you paid me for the extender, just in case it was the extender.

Although it worked fine for me, who knows what could have happened in shipping.

I will send it to the address in your signature.

Hope you sort it all out and get back to full speed mining!

Edit: I am also sending you the .1 bounty you paid.

Don't do that. What if it is my board? So, yea, don't do that. Even if it turns out bad, don't worry about it as no one would have known.

Please don't.

It is already done.

It is quite alright, as a business person I would not feel right keeping the coin.

I have always run my business in this manor, and perhaps I could be more successful if I didn't, but it is who I am as a person.

oboy, what if it's not the adapter? Even if it was, makes me feel like utter shit.

Don't, we are talking about 0.6 BTC here, hardly anything to feel like shit over.

I am just happy that I was able help a fellow form member, do not give it a second thought.

Very kind and thoughtful of you. I apologize for all this.

Note to self: Dreamwatcher is a stand up member.

Word.

Ok.

I had received a pcie x1 > pcie x16 adapter from sadpandatech (https://bitcointalk.org/index.php?action=profile;u=30619), I am mining normally on my pcie x1 slot @ normal hashrates. 370 mhash/s.

So, it was the adapter that dreamwatcher mailed off to me. I know dreamwatchers attentions were good, so don't let this think otherwise of him as he was trying to help me.

I can now mark this thread solved, and I will leave it open for others to scope it out.

Btw, dreamwatcher, where had you purchased the adapter from, if you don't mind me asking? I was notified before I purchased sadpandatechs adapter that he had got his from cablesaurus.com.

So, I thank everyone, everyone, for helping me solve this and everyone that had shipped off quickly an adapter to me, dreamwatcher and sadpandatech.

Thank you to all.

From an Ebay vendor called Emilyandlily.

My guess is that it was damaged in shipment, as when I pulled it , it was was working OK.

Those are some delicate solder points from the ribbon cable to the slot board, possibly weakened through my own use.

Perhaps a good lesson here is not to buy used risers, as after use, the solder points could be in a weakened state that are more likely to be damaged in shipping.

I am glad you were able so solve your issues, and I think we both both learned a valuable lesson.  :)

any of the ones I either was going to be flexing a lot or were not wrapped very good at the connectors, I have taken and ran a few windings of electrical tape around the soldered points on the pcbs. So far, so good.

I have had 1 extender that arrived bad (a 1x to 1x), though I am not completely certain. I may have used it briefly when testing cards and assumed the card was giving me a hard time before I verified the connector as bad. No visible signs of borken connections on it. I did not troubleshot it as I had extra around at the time.