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[Official] 7870 Tahiti LE (XT) Owners Club - Page 19

post #181 of 5228
Quote:
Originally Posted by Kanashimu View Post

Do your clocks fluctuate at all, according to GPU-Z? If it ever falls below 1210 @ full load, your OC is not stable.

Run a benchmark with GPU-Z in the background, and refer to the chart afterwards.

I've noticed a lot of posts about how 1200 Mhz or something is stable. It is NOT stable if it has to throttle between your OC setting and the stock setting (in rare cases it can also underclock to 2D clocks). Your framerate WILL be different if it is constantly at the OC target. The Myst does not artifact easily - its power controls will simply underclock back to stock if you pass certain thresholds, perhaps for power draw and temps. Do NOT get the false sense of security that 1200 Mhz is stable just because you don't see artifacts or programs crashing.

Edit: for clarity, I'm talking specifically about the Powercolor's Myst 7870. However, basic concept should be the same.

I will run GPUZ during a Heaven run tonight or tomorrow. With my 7850 card, when I ran GPUZ during Crysis, I had a major crash - clearly the card/drivers could not handle Crysis, Trixx, and GPUZ at the same time.

Throttling can sometimes be caused by MOBO and CPU bottlenecks. My board is a little behind the times, ASUS M3A79-T Deluxe with an AMD Phenom II X4 975 BE 4.1 ghz OC. Usually if there is throttling I will see pauses in the Heaven run and/or my mouse cursor will become hard to control.

Regarding powerdraw, my ambient is 180 watts and at a huge Crysis 3 set the draw is a total 450 watts (briefly), usually about 440w. I am using a "Zalman Mult-Fan Controller" that tracks total draw. Power is supplied via a Seasonic 700w PSU.
Edited by Bluesman - 3/29/13 at 9:16am
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post #182 of 5228
Quote:
Originally Posted by oats2012 View Post

can you please post your trixx settings (preferably pics, settings, steps you took etc.) I'm getting fed up with Afterburner myself. I just unistalled afterburner to play with trixx. can AB still be used (installed in order to see on screen fps etc. in game) ?

Thanks so much!

I will try to give you the steps I took. First at 1100/1500 I set voltage at 1212 (My default voltage is 1187v). I set fan to profile (?) then tuned it to minimize noise but maintain cooling thresholds. Today or tomorrow I will post my custom fan profile settings photo (I will probably use the windows Snipping Tool.) Fan % of around 40 is fairly quite in my environment, so I used this to configure the ramp around the 60 to 75 range. As I recall right now 70 = 40% fan but my photo will show for sure.

Based on TechpowerUp's review by Wizzard, I used his clock and memory settings, 1210/1620 at the voltage of 1212, to see what would happen. Surprisingly the temps were slightly lower than the 1100/1500 run, 73 deg. verses 75 deg. Note that he runs his OC at default Bios settings - which are 1.23v (measured) during Blue-ray playback.

I would not run two or more gpu tweak tools at the same time. Don't run AB and Trixx at the same time. There are Crysis consol commands that will give you fps. I do not recall them but the knowledge is in the Crysis forums. Some games have this feature as well as benchmarks. Tomb Raider (which is in the MYST promo packet) has a benchmark feature - use it to see your progress or the free Heaven program. (Just a personal bias: I have forsaken AB and ASUS GpuTweak as they both cause instability in my specific computer configuration.)

NOTE: Be careful with the "RESET" feature in Trixx. After my 1210/1620 run it set voltage default to 1256 not the true default of 1187. I always use Profile #1 as a repository for my default settings, so I knew there was something wrong.

NOTE #2: Just a reminder that I use a Silverstone FT02 case which dispenses heat differently than a standard case. I also watercool my CPU with a large 180 sized-double, slim Magicool rad.
Edited by Bluesman - 3/29/13 at 11:36am
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post #183 of 5228
@ 8800gt

I was just wondering when you got yours. I also live in Canada and purchased the EZ from NCIX (ordered March 14th, shipped out same day and I received the 18th).

Mine had come with the 31 bios and, until your post the only 32 bios going around was (possibly) a beta jumping forum to forum. I was just curious.

I still haven't taken the time to flash it or anything so mine still does have the throttling issue, but my temps look good and the stock stock performance is satisfying my wants so it's not yet high on my to do list.

On the issue of stock performance, i *finally* got to play Bioshock last night after a long week of work and school.
Was surprised the game defaulted me to medium settings, but pumped it up to the Ultra preset. Played smoothly at 1920x1200, but because of screen shear I turned on VSynch half way through.

After 4.5 hours of playing (and dying many many times due to clumsy controller and unfortunate re-spawn positioning) HWmonitor reported my gpu max temp at 72C which was a nice surprise. I did have my stock 600T fans at max throughout however, and look forward to their spectre pro replacements!
post #184 of 5228


FYI: Here is the custom fan profile that I used in both my 1100/1500 and 1210/1620 runs. Temps were 75 and 73 respectively. ( Note that Crysis 3 runs about 68 degrees on graphic intense sets.)

Please note in the Settings section I have checked save fan settings for profile. This is important as you want your default settings on Auto and your OCs on the option you want in 3D runs, i.e. auto, fixed, or custom. I found that when default is on fan auto, you do not have issues with Sleep startup. This was especially true with my 7850 card, maybe different with Tahiti.
Edited by Bluesman - 3/29/13 at 10:41am
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post #185 of 5228
Quote:
Originally Posted by spp85 View Post

I bought my new Sapphire Radeon HD 7870 XT with boost and its a terrific performer especially after overclocked and the card sits on a CM elite 330 cabin with two 120mm front and rear fans. But I'm a bit concerned about its GPU temp and VRM temps. GPU @ 1150 core temp reaches 81C Max drool.gif and VRM temp goes as high as 102C devil.gif . Since Im living on a tropical place India, during hot summer here temp of ambient temp are around 30C+. Will these temps kill my card ? When I contacted sapphire support they said VRM temps will go that high and its normal, and is covered under warranty wubsmiley.gif

Thank you so much......

Temps are high I would consider after market cooler

As far as our warentie and RMA sapphire is strick took me 3 days 2 get a number u need a receipt from one of there dealers or no warentie

If our not in america I'm sure it will be hell getting a RMA

Check and see u can always talk to a rep if u got no warentie slap a cooler on that thing
post #186 of 5228
Quote:
Originally Posted by Bluesman View Post

I will run GPUZ during a Heaven run tonight or tomorrow. With my 7850 card, when I ran GPUZ during Crysis, I had a major crash - clearly the card/drivers could not handle Crysis, Trixx, and GPUZ at the same time.

Throttling can sometimes be caused by MOBO and CPU bottlenecks. My board is a little behind the times, ASUS M3A79-T Deluxe with an AMD Phenom II X4 975 BE 4.1 ghz OC. Usually if there is throttling I will see pauses in the Heaven run and/or my mouse cursor will become hard to control.

Regarding powerdraw, my ambient is 180 watts and at a huge Crysis 3 set the draw is a total 450 watts (briefly), usually about 440w. I am using a "Zalman Mult-Fan Controller" that tracks total draw. Power is supplied via a Seasonic 700w PSU.

Well if a 4.7 Ghz 2500k is a bottleneck then kill me. I can't overclock any higher in my passively cooled case.

Rest of computer is Asrock Extreme 3 Gen 3 & Corsair HX 750. Unless there are problems I'm not aware of..

The Myst throttle problem is insanely common. I'd go to say that most people who have it don't even know because they don't bother looking at their GPU-Z graphs on full load.
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post #187 of 5228
Quote:
Originally Posted by Bluesman View Post

I will try to give you the steps I took. First at 1100/1500 I set voltage at 1212 (My default voltage is 1187v). .

what did you use to change the voltage? I tried afterburner with voltage and even though it says it saved, when i look at the voltage usage chart, it always says i am using 1255mV. Doesn't matter if the voltage is set to default (1118) or i set the voltage to 950 or setting it to 1200, it always uses 1255 in my usage chart. Strangely, the gpu-z chart says i am using 1232mV during this time but regardless, it is using more then what i set the voltage too..
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post #188 of 5228
Quote:
Originally Posted by ztkraptor View Post

So, hello all.
I'm new here, but not new to overclocking.

So I have myself 2 of the Myst Powercolor Cards running in Crossfire.

I'm running at 20% voltage thing, and im at 1185/1600
Normally in Heaven 4.0 I get like 66 average FPS i think.

Well, I pushed the memory up a bit more, and now its only getting around 20fps in it.

I reset the card to default, and tried again, same result bad FPS now in Heaven...how could or what could have caused this? Seems odd to me

However, I'm getting the same FPS that I normally got in BF3 and any other games it seems.
So, what could have caused this?
Should I uninstall the drivers and re-install?
Doesn't seem to make sense.
What would cause this sudden terrible fps in Heaven 4.0?

It seems that many Mysts do not like the memory overclocked. Tom's Hardware did a review of this card and recommended keeping the memory at 1500. My advice is keep the memory at 1500 and only OC the core. If you got a good Myst, you can run games all day and night ath 1200/1500 like I do. Benchmarking I can sometimes get the core up to 1253 without artifacting. Nothing wrong with the card..

http://www.tomshardware.com/reviews/tahiti-le-7870-7930-benchmark,3401-5.html
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post #189 of 5228
post #190 of 5228
Quote:
Originally Posted by jimbo02816 View Post

It seems that many Mysts do not like the memory overclocked. Tom's Hardware did a review of this card and recommended keeping the memory at 1500. My advice is keep the memory at 1500 and only OC the core. If you got a good Myst, you can run games all day and night ath 1200/1500 like I do. Benchmarking I can sometimes get the core up to 1253 without artifacting. Nothing wrong with the card..

http://www.tomshardware.com/reviews/tahiti-le-7870-7930-benchmark,3401-5.html

Also I have my myst at 1600 memory..seems fine.
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