Nice to see you totally ignored how I proved TDP in that test was 175W 75% of the time.
It doesn't particularly work that way in heatsinks, that cooling power is higher at 90C. The limit of heatsinks is the immediate transfer of energy from the base plate to the cooling fins, where THEN the cooling is increased. Heatpipes max out pretty quickly, and the chip temps just rocket after the limit.
This choice of heatsinks along with their dodgy/failed thermal simulations which they never properly answered after 3-4 pages are suggesting they either are getting it very wrong @ 250W, or they really don't believe it will be >200W and aren't catering for >200W at all.
As I've also said before, the need for them to be getting things right is blinding people from seeing logic set out line by line.
Dear Armchair engineer, When you take in millions of dollars based on your expertise in the industry your opinion my be valid. However I would bet money on that everything you say is likely incorrect or irrelevant to what KnC is doing. A lot of these "AE's" (Armchair Engineers) like to throw numbers around that have no real meaning in the actual real life scenario just to prove some point that again has no relevance to the current situation. TL;DR Give KnC a call, express your concerns since apparently you think you are so correct. They will likely send you a free unit for correcting their terrible mistake..... (laugh out loud) Dear Non Engineer, You don't have a clue about any of the technical information in this thread. Again you're just dismissing the logic spelt out line by line with the sentiment "they must be getting it right". tldr: Greed/desperation > logic. Please continue not bringing this up to KnC themselves for review, you obviously don't have any trust in what you say otherwise you would be doing just this. You are here to try to convince the community that you have 1/2 a brain, but as we can already see people have destroyed your claims. Logic dictates you are trolling as you don't even have the testicals to try to prove your work to the company at hand formally. Now be a nice dogie and go play fetch. That's a good boy!! Again, rather than actually refuse my claims directly you just dismiss them nonchalantly. No problem, I don't have KNC preorders. Ignore away. |
|
|
|
Nice to see you totally ignored how I proved TDP in that test was 175W 75% of the time.
It doesn't particularly work that way in heatsinks, that cooling power is higher at 90C. The limit of heatsinks is the immediate transfer of energy from the base plate to the cooling fins, where THEN the cooling is increased. Heatpipes max out pretty quickly, and the chip temps just rocket after the limit.
This choice of heatsinks along with their dodgy/failed thermal simulations which they never properly answered after 3-4 pages are suggesting they either are getting it very wrong @ 250W, or they really don't believe it will be >200W and aren't catering for >200W at all.
As I've also said before, the need for them to be getting things right is blinding people from seeing logic set out line by line.
Dear Armchair engineer, When you take in millions of dollars based on your expertise in the industry your opinion my be valid. However I would bet money on that everything you say is likely incorrect or irrelevant to what KnC is doing. A lot of these "AE's" (Armchair Engineers) like to throw numbers around that have no real meaning in the actual real life scenario just to prove some point that again has no relevance to the current situation. TL;DR Give KnC a call, express your concerns since apparently you think you are so correct. They will likely send you a free unit for correcting their terrible mistake..... (laugh out loud) Dear Non Engineer, You don't have a clue about any of the technical information in this thread. Again you're just dismissing the logic spelt out line by line with the sentiment "they must be getting it right". tldr: Greed/desperation > logic. |
|
|
|
I thought that OC doesn't apply to new blades.
Its still the old blades, new are delayed. |
|
|
|
Nice to see you totally ignored how I proved TDP in that test was 175W 75% of the time. It doesn't particularly work that way in heatsinks, that cooling power is higher at 90C. The limit of heatsinks is the immediate transfer of energy from the base plate to the cooling fins, where THEN the cooling is increased. Heatpipes max out pretty quickly, and the chip temps just rocket after the limit. This choice of heatsinks along with their dodgy/failed thermal simulations which they never properly answered after 3-4 pages are suggesting they either are getting it very wrong @ 250W, or they really don't believe it will be >200W and aren't catering for >200W at all. As I've also said before, the need for them to be getting things right is blinding people from seeing logic set out line by line. Had to edit just to add this quote, its too precious: You keep hammering these points over and over again, but even if you're right it doesn't prove that KnC's chips won't ship. It makes no sense.
|
|
|
|
|
If you want me to verify a prototype once its up and running, send it my way and let me know what baby food it likes. I'm sure my clients would be interested.
|
|
|
|
i read from another thread that different batches of avalons have different number of mounting holes to the case?
batch 1, 8
2, 7
3, 5 screws?
Correct. The only things you need to cool are the chips themselves, the rest of the boards are designed passive. That's not to say other bits of the board won't need additional cooling, but for now they're cooled passively. |
|
|
|
ok
I just did a similar mod for the Batch 1
all i did was tape the open areas between fans and the units. the units in batch 1 are very closely packed together so there's no need to tape it between the modules like dogie did.
Anyway results are rather clear from just 20mins of run time
temps stay the same but the fans work lesser to lower the temps.
they tend to stay at their max rpm for a shorter duration when it reaches the threshold temp
most of the time it's below 3000rpm (the fans are delta afc1212de instead of the nmb ones)
I found similar results. In my setup they never have to run at max rpm anyway, so the 'idle' or maintaining rpms are lower for the same temps. |
|
|
|
This 120mm fan does 74CFM @ 1300RPM. It's $9. And actually it's the exact same fan used in the heatsink, as a separate product. Here's another fan from another company 1500RPM, 71CFM, $12 and this one is 1400 RPM and 74CFM, for $11.50. Seriously dude, WTF are you talking about? You're obviously wrong and clearly don't know that much about fans and heatsinks, as these specs are clearly possible and readily available. Each one is about $40 on Newegg, btw - so that's $160 on cooling if you bought them retail. plus the main case fans. And even if the specs were off, it wouldn't matter as they're actually overpowered for the expected thermal output. Yes, I am aware what fan it is.... If I said my car does 350mph, would you believe me? No, its a number on paper. When you look at the benchmarks or test them yourselves, they just don't perform up to the advertised specs. Have a look at a table of proper fans. http://www.quietpc.com/120mmfans There is no reason why the dirt cheap would outperform the considered flagship 120mm parts, unless the specs are just overstated. Overstated specs -> almost no one will ever be able to say otherwise, and hey who would listen to them when you can buy these holy grail fans for so cheap? Let me show you another way. This is a review/test of the heatsink by X-bit. Methodology: http://www.xbitlabs.com/articles/coolers/display/arctic-freezer-i30_4.html#sect0Look at the picture of the test, we can see that at the screenshot the TDP was 27W. If we extrapolate to find the peak, its ~6.5x higher = 175W. Note that wasn't a 100% load in the sense that it was only at 175W for roughly 75% of the time. http://www.xbitlabs.com/images/coolers/arctic-freezer-i30/zfullscr_big.png *not embedded because its massive* If you then look at the cooling performance at this 75% 175W: http://www.xbitlabs.com/articles/coolers/display/arctic-freezer-i30_5.html#sect1 Room temp was 24C. At max fan speed the chip was still reaching 79C. So lets recap: Test was 175W for 75% of the time. Ambient was 24C, which is fair. Fan speed was max, which is fair for testing the max cooling capacity. However the chip still reached 79C. We want 250W 100% of the time for KNC, and 320W 100% of time for the reported specs to be true. The rating specs are asking for more than double the actual tested heat output, so there is absolutely no way that heatsink is going to get away with 320W. Oh, and I'm assuming you're aware that where those case fans are mounted is either the intake or the fan is mounted the wrong way. |
|
|
|
Take the offer you have, it won't be beaten. What makes you so sure woofo? Because its paying higher than anything else on the market. I don't talk about ROI (I dont care, and its subjective) - I'm just comparing the market. And rather than it sounding like a negative thing, I mean to tell the seller its a good offer and to accept it before it gets removed. |
|
|
|
|
Would you accept 3.9btc for both?
|
|
|
|
|
I would advice to ignore all this simulation. Just over spec to the max, its not as if you'll be aiming to run the watercooling just at the edge of its capacity.
Platinum heatsink and radiator please.
|
|
|
|
|
Arrange with someone with a US account? Although I'm guessing it would be breaking some law somewhere to be trading 'anonymously'.
|
|
|
|
|
Take the offer you have, it won't be beaten.
|
|
|
|
AFAIK from reading and looking at design schematics, the main regulator or w/e it is is only capable of around 20A output. We may be gettin pretty close to that on just stock overclocks...
So, overvolting safely may be out of the question.
Why you are saying is capable of only 20A? Grr, I cant remember where yifu posted the design schematics. But the one that shows the layout for each miner board, shows in the VRM section. The main controller chip .. is it a TI or something? Look it up and its max output was like 20amps Limit for IC is only a "soft" limit. From IC's point of view, it's more up to its ability to drive gate and Miller capacitance of output transistors. The Iout, is what I was referring too, your saying thats just a soft limit? Are the mods you speak of .. capable of working on b2 units as well? (I dont know if anything changed from b2 to b3 hash boards...) AFAICT from visual inspection the actual hashing boards themselves remain the same. The connector board on each module has changed, as have the PDU and control boards. |
|
|
|
A little change on the sales policy. I will not accept escrow. And the sales goes fine in China. You can see Avalon move out of my mining farm one after one. The new price is 98BTC. shipping from China.  Just out of curiosity, why did you decide to stop using escrow? Speed. Cash held for 5 days isn't the same as cash in hand. |
|
|
|
so some have speculated that the address 1FGAftzSTztFSB8LMwsrdCKTyqGY6zr3sU belongs to Avalon. well 10000btc just came out of that wallet after it has been dormant for almost 2 months. any ideas anyone?
Yifu once intimated that that wallet might not belong to Avalon, hence no BTC ever went out for foundry payments etc. Whether that's true or him blowing smoke up people's asses is another story tho. Certainly they wouldn't need that order of BTC for their refunds though.. It might be that this address belonged to bitinstant and they collected the payments from one customer there. They paid out yifu from other addresses and now maybe the bitcoins were needed to pay out another person again. That would require a hell of a lot of capital for bitinstant, rather pointlessly as well. There is something a bit more complicated going on here. |
|
|
|
|
This is why ignore lists exist.
|
|
|
|
|
Yeah don't know what that was... anyway, I was remarking that I don't believe the heatsink to be able to dissipate 320W of heat - as they claim it to be able to. And as you can see, the fan CFMs just don't make sense. If it was really 70+ @1200rpm, it would be the best on the market, and not the £4 retail it actually is.
|
|
|
|
John was around as of last night so he probably is still here. Or I can do it if you want  |
|
|
|
LOL at the desperation in this thread, people going to be sad when KNC runs away.
It was a larger model than I thought as I just skimmed over the pic, but just try running that at 320W 24/7 LOL.
So now the chip is 320W instead of 250W? When did that happen. Apparently it's really difficult for you to keep numbers straight in your head. You're saying its rated at 320W, I'm saying its not. AC are renowned for overstating their numbers. Just look at the CFM on that 12CM 1200RPM fan ^_^ |
|
|
|
|
Show Posts
