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Originally Posted by xPreatorianx
For gaming, yes, that is obvious, since gaming actually uses the cpu. However for mining it makes no difference.
So while the performance decrease may not be outwardly apparent, it's still there. Major bottlenecking that I have seen has manifested itself in gaming. But it does show in applications such as bitcoin mining, and folding@home
Cpu usage certainly means something. It means it's not being used.
Also that 99% usage doesn't mean crap. Just because it's being used ~100% doesn't mean the performance is still there. You need to monitor the actual performance. Memory usage, Mhash/sec (in this case instead of FPS), etc etc. Simple GPU and CPU usage statistics won't show a bottleneck at all.
Uh, yes there would? A cpu is more or less the most important component in a pc most of the time. While a gpu is of course more important for things like mining, and gaming (for which a good cpu is still very important), a gpu doesn't matter at all for most things, like browsing the internet, etc, while a cpu does.
Trust me if modern GPU's didn't bottleneck older CPU's there would be no reason for me and millions of other PC enthusiasts to buy newer CPU's. But you also have to worry about your PSU as well. Now your gonna say "well what the hell does the power supply have to do with anything?" Well put simply if it isn't powerful enough to handle your brand spankin new GPU, then your gonna either A) get noticeable performance decreases or B) in some cases silent damage over time to your PSU and GPU. As well as all the other components in the system. (yes an under powered PSU may not cripple the machine but will fry it over time.)
I'm currently getting 230 mhashes on my 5770 at 1015/300 mhz. Pushing it up further has gotten me ~250 mhash, though it was unstable. At stock speeds it gets 180 mhashes, which coincidentally is exactly the number i see all over the place for 5770s at stock speeds. You cannot possibly get a bottleneck from a component that is not being used at all. Feel free to ask anyone else with a 5770 and a cpu that isn't 6ish years old how many mhashes they get with poclbm with -v -w256 -f10, with their gpu at 1015 mhz core clock, and 300 mhz memory clock. I promise, it'll be right around 230 mhashes +/- a few.
Damn I completely forgot about Opencl and cuda. So I'm partly wrong. I agree with you though that no matter what the CPU is involved and if you need to check for bottlenecks CPU/GPU useage won't do it at all. Yes the GPU might be taking the full load. But how do you know by that statistic it's doing it at the correct speeds?
But I should rephrase my statement to CPU's going further back then the last 2-4 years. 2-4 year old CPU's should be good. Anything older than that and yea I still think there would be a bottleneck. I may do some testing on my old AMD machine. But with Crossfire/SLI I completely agree, there is a guaranteed performance hit.
Final EDIT: So on that note I'll just agree too disagree with ahou until I can prove/disprove my side personally on a test machine.
after reading this article it intrigued me to research this bitcoin mining more.
I have two computer both with a HD6950 in them, overclocked to 925MHz on the core each and they both pump out about 355-377MHash/s so 710-754MHash/s total.
with that amount of power it thought hey, i could probably make a decent buck since i dont pay hydro. sadly i ended up finding out that in most pools you are lucky to even make 0.5BTC a day.
I did manage to make 1BTC and cashed it in for a $10 gift card to newegg.ca (worthless with shipping costs), but none the less it works and people are willing to pay you for them.
Solo mining is a joke right now since the difficulty is so high and the chance of you ever gettinga block on your own is about %0.0000000001 chance.
but if you can find a good pool with Pay per share and you have a good hash rate you can make a decent amount per day.
Yeah, you're not going to get rich on bitcoins (not anymore anyway), but it's still not bad for free money. A few hundred dollars a month isn't much of course, but it's free money, so why not?
Originally Posted by sscultima
Uhmmm. Ahou is completely bang on fyi. Mining on a Core 2 Duo or an i7 makes no difference with same gpu.