Seems to work fine for me on my 2x 6950's
https://i.imgur.com/04dEk.png
Topic: heads up: HD6xxx memory does NOT actually underclock - page 2. (Read 4563 times)
69xx can be underclocked, but only to about 125 MHz less than GPU clock. try to uc less than this and temps rise. look a bit harder and you'll see that mem clock has reset back to max. there are plenty of threads here addressing this issue.
although i would belive it can't be underclocked as far
That's not even remotely true. Shittily programmed software can artificially limit the underclocking for people who don't know what they are doing, but the hardware itself is fine with it.The graphics cards will underclock all the way until the computer crashes, somewhere between 0-100 mhz. Some 1st generation gddr5 controllers on certain Cypress revision will crash at certain specific frequencies, yet you would be fine by staying 1 mhz above or below these hotspots.
and are you able to take a screenshot of the sensors?
You require screenshots. 
....Am I untrustworthy or something?
Some basic googling should be enough to prove what I'm saying.
http://www.legitreviews.com/article/1488/17/
It can be underclocked, its a bug in gpuz.
Everything else will show its underclocked, and doing bandwidth speed tests on the card shows it to be underclocked.
Everything else will show its underclocked, and doing bandwidth speed tests on the card shows it to be underclocked.
This is the first i've seen someone claim it can't be underclocked at all although i would belive it can't be underclocked as far have you tried something like only underclocking it 50 or 100mhz just to verify? as for KKAtan what card are you using the 6770 and 6750 are only rebadged 57xx cards.
I can confirm what Haploid has just mentioned,you cannot underclock but it seems to be on the 69xx series.I have a 6900 series card and can confirm it does not allow the memory to underclock.This could be locked in the bios as I've tried using tray tools to underclock which served me quite well when I had a 5770 and that definitely underclock on the same system.
Catalyst 11.6 on Win7 64-bit.
what drivers and OS are you guys using?
so you verified that it underclocked fine? or did it not work also?
It worked fine and the Afterburner stats showed it. MHash/s went up and temps went down.
I have with my 6870.
so you verified that it underclocked fine? or did it not work also?I think your computer might have some issues. Perhaps Afterburner and Trixx are interfering with each other?
Mine underclocks just fine according to gpu-z's sensor graphs.
i verified this independently from each other by having only either trixx or afterburner open, and it's the same results. what card are you running? and are you able to take a screenshot of the sensors? Mine underclocks just fine according to gpu-z's sensor graphs.
I think your computer might have some issues. Perhaps Afterburner and Trixx are interfering with each other?
Mine underclocks just fine according to gpu-z's sensor graphs.
Mine underclocks just fine according to gpu-z's sensor graphs.
I have with my 6870.
for all you guys that are claiming that you underclocked the memory of your HD6000 series cards to lower temps and power consumption, well i just found out the hard way that the memory on these cards do not actually underclock. you may be able to manually set the memory speed lower in MSI afterburner or sapphire trixx, but the settings don't actually "stick". you can actually verify with various sensors that these settings don't actually work. the HD5xxx series cards underclock wonderfully, but there's something about the 6xxx that won't allow this. i have tested this with 6570, 6970, and 6950, they all can't underclock the memory.
refer to his example screenshot i took of the new 6950 i just bought. you can see in the GPU-Z info that default memory is 1250mhz, and supposedly the speed is currently unclocked to 300mhz. you can see in sapphire trixx and the setting panel of MSI afterburner that i set the memory clock to 300mhz (after unlocking the config file of course). now, if you look at the GPU-Z sensors tab and the hardware monitor graph of the MSI afterburner, you can see that the memory is still actually 1250mhz, regardless of what i manually set the memory to. so on these 6000 series cards, you can overclock the memory, but not underclock it.
if you underclock your 6000 series, please check your sensors again to verify this, and post back here whether this is true or not. and i challenge anyone to prove me wrong, or find a workaround for this "lock".
refer to his example screenshot i took of the new 6950 i just bought. you can see in the GPU-Z info that default memory is 1250mhz, and supposedly the speed is currently unclocked to 300mhz. you can see in sapphire trixx and the setting panel of MSI afterburner that i set the memory clock to 300mhz (after unlocking the config file of course). now, if you look at the GPU-Z sensors tab and the hardware monitor graph of the MSI afterburner, you can see that the memory is still actually 1250mhz, regardless of what i manually set the memory to. so on these 6000 series cards, you can overclock the memory, but not underclock it.
if you underclock your 6000 series, please check your sensors again to verify this, and post back here whether this is true or not. and i challenge anyone to prove me wrong, or find a workaround for this "lock".
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