thank you Kano!

I got the U formula.


What about if pool is not 1 diff shares let us say it is dynamic? If it is static let us say 2 diff shares all is easy - 2^33 right?
Best

kano,

It may sound stupid but i am little bit confused of values i see. As you noted with new bitstream and timing 2:70 Mhs reporting will not be correct. To make things easy, assuming that cgminer shows  correct values for my gpu as follows:

MHS av   MHS 3s   Accepted   Hardware Errors Utility   
 391.03   391.16   6,129                    0       5.55/m

For my best lancelot board values are as follows:
MHS av   MHS 3s   Accepted   Hardware Errors        Utility   
506.35   662.20   6,651             131                  6.02

What about calculating Lancelot performance in following way
Lancelot Utility/GPU Utility*GPU MHS av
 6.02/5.55*391.03 = 424 Mhs

What about HW errors - are they taken into account when calculating utility. In my case for Lancelot they are 1.97% (131/6,651*100). Shall i do something like:
424/100*98.03=415.64

Thanks

Thanks!
I got it...

Hey,
thank you for the update! It seems that you know hardware stuff better than me (i am not expert at all). From what i have seen in pdf (core_power) schematic (i might be wrong of course) we have to measure a voltage VCCINT1V2_A and  VCCINT1V2_B. Is that true? If it is, are the wholes you are referring to equal to "VCCINT1V2_A and  VCCINT1V2_B". If yes, would it be very hard for you just to mark them on the picture, because it is very hard for me to find them out:)
Once again excuse me but as i said i am not an expert at all:)

http://www.1728.org/resistrs.htm
Calculation showed about 90-100K
+1 for the question where to measure VCC out core voltage

That is why i plan to bump voltage on mines little bit more using potentiometer (Zetex voltmod  probably i will get 500K in parallel)
I will do it this weekend and will share the results  - i plan to bumop it around 1.28-1.29 < 1.30 just to be on a safe side as nghzang suggested:)

5.63 seems like no improvment? What about utility before changing the res? Have you measured that?

Pls let us know what will happen with U 24 hours later. Have you measured Core voltage before/after changing resistors?

I just wanna share my result so far...
All Lancelot's are v1 lower core voltage


 ICA  0:                | 758.9M/858.7Mh/s | A:2699 R:0 HW:71 U:  5.62/m
 ICA  1:                | 870.0M/888.8Mh/s | A:2822 R:1 HW:49 U:  5.87/m
 ICA  2:                | 884.2M/889.8Mh/s | A:2780 R:2 HW:26 U:  5.78/m
 ICA  3:                | 880.9M/874.2Mh/s | A:2757 R:0 HW:54 U:  5.74/m
 ICA  4:                | 865.6M/880.2Mh/s | A:2724 R:2 HW:52 U:  5.67/m
 ICA  5:                | 857.9M/876.1Mh/s | A:2748 R:0 HW:35 U:  5.72/m
 ICA  6:                | 873.7M/865.3Mh/s | A:2777 R:0 HW:56 U:  5.78/m
 ICA  7:                | 857.5M/867.4Mh/s | A:2735 R:0 HW:34 U:  5.69/m
 ICA  8:                | 866.8M/866.5Mh/s | A:2790 R:0 HW:54 U:  5.80/m
 ICA  9:                | 708.7M/861.4Mh/s | A:2698 R:0 HW:43 U:  5.61/m
 ICA 10:                | 880.1M/874.1Mh/s | A:2736 R:0 HW:70 U:  5.69/m


Average utilization with stock v3 bitstream was about 5.2 - 5.3 which is about 10% improvement
My next step will be to bump up core voltage to 1.26 as suggested and i will share results..
Nghzang,
Can we bump input voltage a little bit more? Is it safe to stay below 1.3 V as you suggested. Probably 1.295 IDLE will be even better instead of 1.24?

nghzang (or someone else),
i am not good with hardware at all. is it possible just to take a shot of lancelot an mark where two resistors are. otherwise i have a friend to do soldering for me but pcb schematics are beyond our knowledge

 

Super!
------------------------
add some core voltage will help, default Lancelot core voltage is 1.16V, you can change it to 1.26V by change R56 and R47 to 9.1K. certainly, there are risks and more heat.
------------------------
Can you give us some info what additional boost are you getting when changing the resistors. Heat and power are no issue since winter is comming:)
I just want to know the numbers to make my decision. For instance difference in performance "%" between your best board with 42 bitstream stock resistors compared to same board with  R56 and R47 to 9.1K?

10X

That sounds great!

Ngzhang you are the one to be trusted!

Thank you very much!!!

I will test it in the evening.
Just a side question. Where we can get default Lancelot Bitstream just in case? Is it same bitstream used with icarus V3?
10X

What are they saying to you?
That competition will be first on the market? Or BTC price will collapse or both?
What is meant to happen will happen we chose one road so we have to stay calm and cool.
Any way except to loose some money nothing worst can happen right:)

+1
You are the man DOC:)

+1

it is spartan 6 and it is performing...The git file source has been edited probably and what i see is commented

Yes it is. The difference between cm1 and icarus should be


https://github.com/ngzhang/Icarus/blob/master/FPGA_project/Src/fpgaminer_top.ucf
# UCF for a Nexys2 500K board
NET "osc_clk" LOC = "J1";

# serial port receive & transmit
NET "RxD" LOC = "D1";
NET "TxD" LOC = "B1";

# TTL level serial port: ja3 = rxd, ja2 = txd
NET "extminer_txd<0>" LOC = "D22";
NET "extminer_rxd<0>" LOC = "B22";

there is a chance your bitstream to work on one core only....

makomk, what do you think about that? Will your bitstream work?

I do not have an account since it was not required in the first wave. All of us were in hurry, so..I do not have status page to watch. Anyway i will wait for mail WT instructions..
10X

jayeeyee,

Did you got WT instructions? Were the instructions automatically sent to you with second wave or your order was from the first wave?

probably someone got 30+?