Well, you can claim an impossible PUE of 0 :-)

PUE = facility power / equipment power
If you don't pay, it is as if you provide zero power to the facility, but somehow your equipment gets power anyway... magic yay!

Is this 681 Mhash/s with or without memory downclocking?

I like those that are in stock! Grrrr...

Thank you. Post updated.

Is 680 Mhash/s rounded up by a few Mhash/s?

Are you saying that you, just now, improved your performance from 668 Mhash/s (as you claimed in your previous posts: "670 Mhash/s" minus the "2 Mhash/s from memory downclocking") up to 680 Mhash/s, this time without memory downclocking?

Thanks reeses for these very precise numbers, and quality of the report. (Compared to Syke, I don't know if he was rounding up to 670 Mhash/s, and he doesn't seem 100% sure of the "2 Mhash/s" impact of memory downclocking).

I assume your numbers are without memory clock or voltage changes, right? If yes, I will update my claim to 708/666 = 6.3% faster than Phoenix as I want to convey exact numbers.

I am certaintly interested in the feedback that you guys give me about pricing, thanks. Predicting the demand curve for a given price is certainly not trivial. As nster said, pricing it too low may cause it to be leaked and pirated. I am not going to divulge how many buyers have purchased hdminer so far, but I do think that 350 BTC is a right balance at this moment.

Syke: it is the first time I hear 670 Mhahs/s at 830 MHz. Did you modify other hw settings such as memory clock, memory voltage, gpu voltage?

The number of short-term speculation choices is vastly outnumbered by the other options (respectively 26.2% vs 73.8% after 42 voters). We can probably infer that the value of the BTC is not going to crash in the short-term. That is, unless more speculators start showing up.

I think this poll will interest many.

Ship me or deliver to me a brand new, unopened, boxed HD 6990, and i will pay you 210 BTC. That's $756-840 according to the current MtGox rate of $3.60-4.00. Compare this to resellers selling this card for $709.99 with no taxes if purchasing out of state.

Send me your Bitcoin address beforehand. I will pay you after taking delivery. We may use an escrow service if you want, although I hope I am perceived as a trusted community member by now. My rating is registered with the IRC bot gribble, my nick is "mrb_". PM me or email me at m.bevand@gmail.com

No, 830 is not overclocked.
Overclocking with the switch brings it to 880 MHz.

Damn it. Why is it that 50% of the posters in this thread make mistake when comparing o/c vs non-o/c card? This is what I am saying, all comparisons should be done at stock clocks to prevent mistakes and misinterpretations

As the first post says: with the o/c switch at position 1 (880MHz) = 746 Mhash/s. This means hdminer is faster than Phoenix by 4.5% assuming you did not change anything else (PowerTune settings, memory clock, voltages, etc). Is it the case? Some resident o/c tools automatically changes the PowerTune settings for improved performance for example, even when running at "stock" clock.

They like to force you to have to call one of their salespersons who will price the product according to how much money you have. Market segmentation at work...

That's what I was talking about... On a stock card you will not observe the same Phoenix performance.

Voltage does influence speed. It changes power consumption, which is detected by PowerTune, which in turns dynamically adjusts the clock to make the speed vary by +/- 3-4% in my experience. Temperature also influences power consumption. And voltage influences temperature. It's all intertwined and makes benchmarking very difficult, especially when arguing about a few percents of speed difference.

Reducing memory speed also often modifies (either decreases or increases) performance, depending on the compute shader.

("no" to the 720 number).

Good. I want to collect accurate data, so: stock shader clock as well as stock memory clock? No changes of the PowerTune settings? No GPU voltage mod? No mem voltage mod?

Raulo: I was selling my miner privately in early Jan. And I was using it since Dec. Hence 4 months. Not sure about poclbm. On the contrary, most users seemed to have trouble finding the magic catalyst/sdk/flag combo to reach acceptable speeds. The simplicity of hdminer bypassing the whole OpenCL layer is part of the value I sell. And again, many users who report perf numbers at "stock GPU clock" don't tell you they tweak the mem clock or voltages which influence performance (edit: case in point: Grinder in this thread). Also, some 5970 models are factory-overclocked to 735MHz up from 725MHz. Users may forget this detail when comparing numbers between their 5970s.

Fair enough 

PS: 1 Bitcoin is 1.44 GBP 

Not 720 but 679: 2*830/880.*355 = 679 Mhash/s theoretical. However the best I have seen reported by a Phoenix user on 6990 at 830 MHz is 650 Mhash/s. 708/650 = 9%.

But I agree that quoting a percentage of performance improvement is not ideal... there seems to be such a wide variation across all Phoenix users (due to OpenCL's complexity and CPU usage bug) that it is hard to give a % number that everyone will agree upon. Some Phoenix users even measure much less than 650 Mhash/s on the 6990. What I can promise though is the exact perf numbers I quoted in the hdminer thread: 708 Mhash/s at 830MHz and 746 Mhash/s at 880MHz.

Well, it was not fairly quick. It took 4 months, from January to April, for an open source miner to catch up.

I operate on a best effort basis via email or skype. I have asked customers to post testimonials in the hdminer thread to give you an idea of how good/bad my support is. (Don't trust me. Trust my users.)

I am embarrassed. I meant to pledge for sites in the top 30% pageranks (so 7-10). That's completely my fault. So, I sent you the remaining 95 BTC to match my original 100 BTC pledge because I feel obliged to (technically, you met what I put in written form).
txid 564646ac44166f3c3bd3aef7c63d8ac05b1742088fe08c6788ae74151b8e2892

Mahkul: to summarize, I now raise my pledge from 100 BTC to 125 BTC. I have 375 BTC remaining, so I pledge for maximum 3 more shops. It only applies to shops selling tangible (physical) goods, and only to those of pageranks 7 through 10.