To upgrade your gpu from 20.5 to 23.5mh here is the youtube video to step you right through it. Download the latest driver first just like Citronic said Crimson 16.9.2 then, I did each card one at a time in the slot that they would be placed. Here is the video:
https://youtu.be/OP_zSP2H6hoThanks Aries! I actually had just found that video a few minutes before you posted it. I had been watching some other vids from that same guy and stumbled across that one. Will definitely give that mod a shot after I get everything else squared away. That extra 5 per card is going to equate to a full extra card on my 5-card rig. Did you notice any extra power efficiency from that mod as well? Or would something else need to be employed to accomplish that?
In addition, can you share how you got these GPUs running at 23.5? I have 3 of the exact same cards and they are getting 20.7 each using Claymore 7.2. This is similar to the initial 20.5 you mentioned being the out of the box speed, but I am looking for the easiest way to increase the speed of mine up to the mid-20's like yours. Was it something you did in the settings in Claymore or did you mod/overcloud the cards in some way?
This may be a good start. The premise is the same. Use polaris bios editor to tweak the memory settings. There are additional tweaks you can make, but you run the risk of hosing your card.
Make sure you back up the original via GPUz, so you can always go back !
https://bitcointalksearch.org/topic/m.16426507without rom modding, you can try this.
1. - ethi 16 (maximum ETH hashing using CDM)
2. Crimson 16.9.2
with rom mods:
At present, all my RX480 rigs are zapped with Heliox rom mods the lowpower29mhs version with 16.9.2, stable for weeks at 29.5-29.7MHs. In GPUZ, watts per card is 90s but actual should be more than this but definitely better than 150w. I can run 6 x 480s using a 1300w easily (1000w PSU can do the job).
Thanks Citronik! I looked up that -ethi command in the CDM readme file and understand that it is set at a default of 8, so hoping that uping that will indeed increase the speed. The thing is, I cannot figure out how to enter that command. I was thinking that it is just typed directly into the command window where CDM is running. But, when i try that by starting with the "-", it actually decreases the DCR hash-rate. I also found out the the "+" increases DCR hash-rate and even bumping it from default 30 to 32 does increase hash-rate about 10%, which is encouraging.
But... how do I get that -ethi command to take? I even tried pasting it in but it did not work either.
On the driver update, I simply am baffled lol. I downloaded the exact packet i needed directly from the AMD site... actually has Crimson 16.9.2 in the title, as well as in the header when I launch the installer. I triple checked and made sure that I downloaded the correct version for W7 x64, but after installing the display driver in this packet, my driver now only shows as v16.40. Not sure how this is possible or how to actually get 16.9.2. I ran as Admin and even uninstalled the v16.30 that was on my box before this, but to no avail.
Any suggestions on how to get 16.9.2 installed?