Sudden drop in hashrate! From 90Mhash/s to 50Khas/s

[sewh]

I'm pretty new to bitcoin mining, i just set up my old pc to mine today, at first it was working fine, the hashrate was around 90mhash/s, and i stayed like that for almost two hours, but suddenly, out of the blue the rate dropped to 50khash/s. I have no idea what caused this. I'm using GUIminer with CGminer at the backend.

need help!

[Necrocide666]

Post your PC specs firstly, also your cgminer settings. (NOT your username/pass!!) So that we can see if there is an obvious mistake.

[phluxx]

Firstly, why not just use CGMiner?

Also, if your card dies at a certain unstable intensity/overclock it will often restart with secondary lower clock speeds and you will get almost nothing out of it.  My 7870s drop to around 25-40mhash from 460mhash when this happens.  Restart your computer.

[Necrocide666]

Firstly, why not just use CGMiner?

Also, if your card dies at a certain unstable intensity/overclock it will often restart with secondary lower clock speeds and you will get almost nothing out of it.  My 7870s drop to around 25-40mhash from 460mhash when this happens.  Restart your computer.

Agreed. I use CG watcher for easier monitoring, but 2x miners are unnecessary.

[Tobius]

What are you mining with? This has happened to by 5770 a few times, but only when I end up pushing the thing to far and it automatically throttles

[Necrocide666]

What are you mining with? This has happened to by 5770 a few times, but only when I end up pushing the thing to far and it automatically throttles

What brand 5770 are you using? I have vapor-x, can clock to 940 (/950 max) without issue...... our cards are awesome for clocking, you shouldn't have that problem

[sewh]

Firstly, why not just use CGMiner?

Also, if your card dies at a certain unstable intensity/overclock it will often restart with secondary lower clock speeds and you will get almost nothing out of it.  My 7870s drop to around 25-40mhash from 460mhash when this happens.  Restart your computer.

restarting the pc fixed it. I had the gpu overclocked when i first set up the pc, but when i started mining the screen froze in under a minute. The problem i wrote about happend when the gpu was running at default speeds. I guess i'll underclock the gpu a bit. i'm not even sure it's worth trying to use this old piece of shit pc. (it's been collecting dust in a corner for almost 2 years, i just though i'd set it up to have a, slow, constant mining operation going.)

[Necrocide666]

haha is that even worth it power costs vs. BTC mined?
Glad it's fixed though

[wrenchmonkey]

haha is that even worth it power costs vs. BTC mined?
Glad it's fixed though

Probably not, but if you're looking at BTC as an investment, it doesn't matter what the calculators say you're earning per watt, it matters what Bitcoin is worth when you decide to sell.

[Necrocide666]

Good point, even I am seeing some nice profit with only 600Mhash/s....

[sewh]

haha is that even worth it power costs vs. BTC mined?
Glad it's fixed though

Probably not, but if you're looking at BTC as an investment, it doesn't matter what the calculators say you're earning per watt, it matters what Bitcoin is worth when you decide to sell.

that's the thing, my first priority is getting some BTC.

[ravagetheearth]

This happened to me when I put too much of an overclock on my card and it started throttling on me.

[kikosanchez182]

A bit ignorant of hashrates.  What exactly does that tell us?  Volume?

[Emomorfar]

A bit ignorant of hashrates.  What exactly does that tell us?  Volume?

Increase the power limit. It can also be because the card is getting to hot try get it cooler 7950 are real pain for example as they cant really go over 85C.

[phluxx]

A bit ignorant of hashrates.  What exactly does that tell us?  Volume?

Increase the power limit. It can also be because the card is getting to hot try get it cooler 7950 are real pain for example as they cant really go over 85C.

I find power limit to make mining overclocks less stable if anything.  The card can go over 85c, it only matters what you have your different temperature thresholds set at it - but the lower the temperatures the better.  I try not to push past 70-75c.

If it's throttling it's because it failed being stable and crashed.  Adjust intensity and overclock settings down and try again.