Sapphire Nitro+ 480 8GB Modded - Inconsistent Hash Rate

maomaopopmaomaopop Member Posts: 8
Hi all,

I am new to mining. Just started few weeks ago. I started off with experimenting with different voltage, gpu core speed, and memory speed and I managed to get 24-25 Mh/s. I went a step further and modded the bios by adjusting the memory timing and I think I started to see 28-29+ Mh/s. But when I reviewed the log files and plotted out the average Mh/s, it around 26.5 to 27.5 Mh/s.

I loaded them into an excel spreadsheet, grep the speed and counted the average. So I think that is pretty accurate.
Anyway, I like to share what I am seeing on my mining stats. I hope the community of miner can give me some enlightenment.

Hardware
GPU : Sapphire Nitro+ RX 480 8GB
GPU Memory Type : Samsung
GPU Bios : 015.050.000.000.000000
Only 1 GPU Card
PSU : Corsair 1200 Hxi
CPU : I3 6100
RAM : 8GB DDR4
Virtual Memory : 16000 MB

Wattman Settings
GPU Clock : 1150 MHz
Memory Clock : 2150 MHz
Core Voltage : 1150 mV

Memory Timing (Strapped to 1625 Mhz)
Original
1375 : 333000000000000022CC1C008C515A3DC0570D132DCB74090048C7007A0014207A8900A002000000150D293197282E15
1500 : 555000000000000022CC1C00AD595B41C0570E14B00B450A0068C70003011420FA8900A003000000170E2B34A42A3116
1625 : 555000000000000022CC1C00CE616C47D0570F15B48C250B006AE7000B031420FA8900A003000000190F2F39B22D3517
1750 : 777000000000000022CC1C00106A6D4DD0571016B90D060C006AE70014051420FA8900A0030000001B11333DC0303A17
2000 : 777000000000000022CC1C0031F67E57F05711183FCFB60D006C070124081420FA8900A0030000001E123A46DB354019

Modded
1375 : 333000000000000022CC1C008C515A3DC0570D132DCB74090048C7007A0014207A8900A002000000150D293197282E15
1500 : 555000000000000022CC1C00AD595B41C0570E14B00B450A0068C70003011420FA8900A003000000170E2B34A42A3116
1625 : 555000000000000022CC1C00CE616C47D0570F15B48C250B006AE7000B031420FA8900A003000000190F2F39B22D3517
1750 : 555000000000000022CC1C00CE616C47D0570F15B48C250B006AE7000B031420FA8900A003000000190F2F39B22D3517
2000 : 555000000000000022CC1C00CE616C47D0570F15B48C250B006AE7000B031420FA8900A003000000190F2F39B22D3517



Claymore Miner Screen Capture
Version : 8.0



Sudden drops to as low as 20-23 MH/s. Inconsistent hash rates. I suspect something is wrong and I am out of idea on how to fix it.
My best stable watt/hash rate setting is 1150/2150 @ 900 mV and that yielded average 27 MH/s.

I thought the GPU was throttling due to insufficient power, so I raise core voltage 1.15V to eliminate the power factor but it didn't work. Is what I am getting a norm? It is driving me crazy. I am planning to buy more GPU but I don't want to commit until I resolve it. Can someone help?

-mmp




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