How to find the optimal GPU Clock speed for mining

CarsonCarson Member Posts: 10
Back in the old days of scrypt mining, there are certain ratios between Core and Memory Clock speed to achieve a relatively optimal mining speed.

Today I tried to play with my cards (7950 and 7970), but it seems there isn't noticeable effect, I went with some extreme low clock speed 475/625 on a 7950 and it's still hashing at 20xxxxxx H/s

So if clock speed won't affect hash rate, what will?
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Comments

  • seifer48seifer48 Member Posts: 14
    Core clock rate doesn't have much of an effect on those cards once you exceed 1GHz to my understanding, try bumping up your memory frequency. With GCN 1.0-1.1 it seems to have a pretty large effect on hash rate for myself. I went from 12MH/s to 17MH/s from going from 1200MHz to 1418MHz with my 7870. I'd expect a similar result for you.
  • CarsonCarson Member Posts: 10
    I tried with both my powercolor 7950 and 7970, and change to 1500 only increase 1M/s
    so I rather leave them at stock.

    I will try to keep this config for another 2 days and than lower all clock speed to the minimum allowed and for another 2 days.

    Will report back the result
  • vigmarvigmar Member Posts: 114 ✭✭
    how 17mh/s?I have 12 mh/s, I also have a 7870, I change to 1400 but only increase+ 1mh/s. win10 + drivers16.1.1. :(
  • happytreefriendshappytreefriends Member Posts: 537 ✭✭✭
    On an R9-290 with 2GB, GPU clock affects it very little, but bumping memory from 1250 to 1500 adds 8% extra MH on my rig.
  • vigmarvigmar Member Posts: 114 ✭✭
    I do not understand why I have so little hash ~ 12-13 mh? HD7870
  • restlessrestless Member Posts: 80
    Make some tests with 290 which has to run downclocked because its in a case and will go above 75 deg
    At 800MHz core, changing memory speed between 900 and stock 1250 adds 0 MH/s
    850Mhz as almost as fast as 900, only at 800/800 it goes a bit slower.
    adding 50MH to the core adds ~ 2MH/s (850/925).
    Another 50mh (900/1000) gives only 1MH/s and increasing mem clock again gives nothing
    Obviously there are "best spots" for core/memory clocks
    The card is with the "slower" kind of memory, BIOS used is "Stilt's" one for 290 (disable some TMUs&ROPs)
  • sjenjasjenja Member Posts: 11
    I have a 3 Powercolor hd 7950 found best speed at 1050/1450. 21Mh/S , but my R9 290 AMD goes like crazy.
    I have it downclocked so it does not go above 70 degrees, at 800/1250, 21Mh/s, but if I had water cooling I could have run it at normal clock 947/1500 27Mh/s easy.
  • dlehenkydlehenky Member Posts: 2,249 ✭✭✭✭
    @vigmar : My understanding is Windows 10 sucks for mining, and you will see a big improvement by dropping back to Windows 7 (not 8 or 8.1). I use Ubuntu linux myself.
  • LogicaluserLogicaluser Member Posts: 214 ✭✭
    Memory performance is key for ethereum.

    For most 7950/7970/280x cards that'll be exactly 1500mhz, as anything higher switches you to the next memory strap, and relaxes VRAM timings

    "the stilt" optimized BIOSes from the LTC days seem to offer benefits for some cards, but must be matched exactly to each individual card
  • vigmarvigmar Member Posts: 114 ✭✭

    I found the whole thing to the vendor, Sapphire 7870 ncards perform worse than gigabytes 7870 about 20%
  • restlessrestless Member Posts: 80
    2 sjenja
    Try running 290 at 800/900, I get 22MH/s at 800/900, 23 at 850/925-950
  • CarsonCarson Member Posts: 10
    sjenja said:

    I have a 3 Powercolor hd 7950 found best speed at 1050/1450. 21Mh/S , but my R9 290 AMD goes like crazy.
    I have it downclocked so it does not go above 70 degrees, at 800/1250, 21Mh/s, but if I had water cooling I could have run it at normal clock 947/1500 27Mh/s easy.

    I also have three powercolor 7950 as well, but couldn't get anywhere close to this hash rate
    it's jumping between 19-20m @ 950/1250 (almost stock config), increase clock will decrease hash rate by 2-3M :(

    ASUS 7970 is the only card I can make it hash around 23M
  • shubellshubell Member Posts: 2
    edited March 2016
    well i have quite a few firmwares saved from the good old ltc days. They were all modified by "the stilt"
    here is the link to the excel table
    https://www.dropbox.com/s/sps00tawrdglzwt/79xx & 280 VBIOS Optimization Index.xlsx?dl=0
    and here is the link to some firmwares... i didn't copy all but have quite a few

    https://www.dropbox.com/sh/d7hrmj6cmb9tt8r/AACBWNWj7RDvRtJYxKeHPEC1a?dl=0

    The timings were optimized if i remember correctly... the best frequency for r9 280x was 1500. if you moved to 1501 the timings went up and you lost performance. I get like 1 to 2 mhs more with these firmwares ;)

    oh and use this tool to identify the ddr type
    https://www.dropbox.com/s/wb8urtqmo5g4oom/Identifier.rar?dl=0

    for flashing you need atiflash or atiwinflash ;)

    if you want to check some info from the rom files use this
    http://www.techpowerup.com/forums/threads/vbe7-vbios-editor-for-radeon-hd-7000-series-cards.189089/
    Post edited by shubell on
  • workwork Member Posts: 2,084 ✭✭✭✭
    edited March 2016

    On an R9-290 with 2GB, GPU clock affects it very little, but bumping memory from 1250 to 1500 adds 8% extra MH on my rig.

    Weird... with a modified version of stilt's BIOS on my R9 290s, I can get up to 6MH/s increase with core overclock, but there is no difference at all with a memory overclock (infact, I can downclock memory from stock 1250mhz to 900mhz and only lose about 1MH/s). I can push 31.5MH/s with 1120mhz core; but bumping memory from 1250 to 1500 does absolutely nothing.

    @dlehenky and I use win10 on all my rigs right now. Saw 0 performance benefit with other OS.

    Edit: just noticed this was a pretty dead necro thread. Oh well, blame guy above me =p
  • shubellshubell Member Posts: 2
    timings have a waay bigger effect than memory speed alone ;) Well kinda depends on the kind of work the gpu has to do ;)
    Btw had to post the firmwares as the original links were almost all dead
  • PurgentPurgent Member Posts: 35
    dlehenky said:

    @vigmar : My understanding is Windows 10 sucks for mining, and you will see a big improvement by dropping back to Windows 7 (not 8 or 8.1). I use Ubuntu linux myself.

    I have two W10 rigs mining away without issue. 2x 390 @ 31.8MH, 2x 380x @ 20MH, 1 380 @ 20.8MH. I would not see any improvement going to another Windows version, as they are all at their expected hashrate.
  • hasherhasher Member Posts: 642 ✭✭✭
    Is there any difference in performance between Windows 8.1 and Windows 10? I'm tempted to redeem my free upgrade, since all my rigs are running Windows 8.1 Pro
  • workwork Member Posts: 2,084 ✭✭✭✭
    hasher said:

    Is there any difference in performance between Windows 8.1 and Windows 10? I'm tempted to redeem my free upgrade, since all my rigs are running Windows 8.1 Pro

    None that I've seen. Win10 works just fine. However, I only run the Enterprise LTSB version so I can control stuff like updates and telemetry via GPO.
  • caesar0901caesar0901 NYCMember Posts: 18
    edited March 2016
    shubell said:

    here is the link to some firmwares... i didn't copy all but have quite a few

    Here's a link to all/most of them.

    You can look up which file(s) you need here. The dropbox links in this spreadsheet don't work; however, you can see what the filenames are, and look them up in the Google Drive link above.

  • PurgentPurgent Member Posts: 35
    hasher said:

    Is there any difference in performance between Windows 8.1 and Windows 10? I'm tempted to redeem my free upgrade, since all my rigs are running Windows 8.1 Pro

    Redeem it. There is no performance difference up or down.
  • adasebadaseb Member Posts: 1,043 ✭✭✭
    Tried the one for the Gigabyte 7970 and got the same speed as before with different memory clocks.

    Dont have any of the other listed cards.
  • VuQuocHai1VuQuocHai1 Member Posts: 49
    work said:

    On an R9-290 with 2GB, GPU clock affects it very little, but bumping memory from 1250 to 1500 adds 8% extra MH on my rig.

    Weird... with a modified version of stilt's BIOS on my R9 290s, I can get up to 6MH/s increase with core overclock, but there is no difference at all with a memory overclock (infact, I can downclock memory from stock 1250mhz to 900mhz and only lose about 1MH/s). I can push 31.5MH/s with 1120mhz core; but bumping memory from 1250 to 1500 does absolutely nothing.

    @dlehenky and I use win10 on all my rigs right now. Saw 0 performance benefit with other OS.

    Edit: just noticed this was a pretty dead necro thread. Oh well, blame guy above me =p
    Try 290 with [email protected] dude .
  • dlehenkydlehenky Member Posts: 2,249 ✭✭✭✭
    @VuQuocHai1 That's a bad quote above^^ It makes it appear I use win10, and I don't even touch Windows anything. I'm running Ubuntu server 14.04. Just so it's clear. :)
  • meatologistmeatologist Member Posts: 44
    anyone got a decent OC config for (ASUS) R9 390x 8GB running on Win7?

    I have 3 of these in separate rigs and i get different hash rates for each machine when using exactly the same OC settings in MSI Afterburner. Weird.

    Rig1
    Core Clock 1200Mhz
    Mem Clock 1800Mhz
    = 31-33 Mh/s

    Rig2
    Core Clock 1200Mhz
    Mem Clock 1700Mhz (1800 freezes the OS)
    = 31-33 Mh/s

    Rig3
    Core Clock 1100Mhz (anything > freezes OS)
    Mem Clock 1600Mhz (anything > freezes OS)
    = 24-27 Mh/s

    All 3 machines identical hardware (mobo, CPU, RAM, PSU)
    All 3 machines identical OS + patch level

    any thoughts or comments?
  • 390g390g Member Posts: 45
    anybody has HD7990... i saw some metrics it can be overclocked to 40 mhs ... is that true?
  • restlessrestless Member Posts: 80
    I have 7990, but I'm unable to get more than 36-38
    I suspect its due to my PSU (700W thermaltake), because when I downcloked to 875 I got more hashrate than @ 925. But buying 100$ PSU just for this purpose (possible increase of several MH)... No thanks.
  • restlessrestless Member Posts: 80
    edited April 2016

    anyone got a decent OC config for (ASUS) R9 390x 8GB running on Win7?

    I have 3 of these in separate rigs and i get different hash rates for each machine when using exactly the same OC settings in MSI Afterburner. Weird.

    any thoughts or comments?

    Start downclocking core/mem and find the sweet spot. Right now on Rig1 you burn electricity for nothing
  • workwork Member Posts: 2,084 ✭✭✭✭
    edited April 2016
    @meatologist are you sure overclocking the memory does ANYTHING for hashrate on those cards? Try running stock memclock, I bet it doesn't even drop your hashrate. That's what my R9 290s are like anyway, although I do run custom BIOS on them. I can downclock my memory to 1150 (stock 1250), and hashrate stays the same.

    As for, "decent OC config"; it depends on the card. Every card will overclock differently, there is no magic number.
  • meatologistmeatologist Member Posts: 44
    @work @restless you're quite right. i downclock memory to 1150 and hashrate is not affected.

    Core clock to 1200 bumps hashing from 27 to 33 MH.
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