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post #5291 of 9745
Quote:
Originally Posted by Roboyto View Post

For Trixx make sure you have ULPS disabled and 'Force Constant Voltage' checked in the Settings Tab.  Have you increased the Power Limit? That may help.  If it's not stable at 1600, you can always try to lower the clock 5-10MHz.

You could try Afterburner.  Depending on if your card will allow, I believe the Aux Voltage setting in AB adjusts memory voltage.  Adding a little voltage may help.

It's really hit or miss with Elpida RAM.  Not nearly as many cards with Elpida RAM get good memory clocks compared to Hynix. 

My buddy just bought a VisionTek 280X with Elpida RAM, and his is rock solid at 1175/1700.  I was shocked considering my PowerColor Devil 270X has same RAM chips in it and I could only manage 1565 on the memory.

Both options are already set in Trixx. Also I don't have any aux voltage settings in AB, AB doesn't even give me a voltage setting for my gpu unlike Trixx

Also yes 20% powerlimit is set in Trixx/AMD Overdrive
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post #5292 of 9745
Quote:
Originally Posted by Unknownm View Post


Both options are already set in Trixx. Also I don't have any aux voltage settings in AB, AB doesn't even give me a voltage setting for my gpu unlike Trixx

Also yes 20% powerlimit is set in Trixx/AMD Overdrive

 

Well...only other thing I can think of is driver version.  Are you on a beta 14.X?  They are still a little buggy, but 13.12 is solid.

 

Otherwise, you may have simply hit the limit for your card on the RAM clock.

 

Black screen is definitely caused by too high of a memory clock from my experience, may just have to back it off a little bit unfortunately.

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post #5293 of 9745
Quote:
Originally Posted by Roboyto View Post

  • VDDC is the value you're going to want to watch.  If you were at 1.551V on the core the card would, likely, be toast. 
  • I'm not sure what MVDDC is exactly because my cards don't display that value.  My educated guess would be memory voltage, as most GDDR5 operates at around 1.5V
  • Dangerzone on these cards I believe is north of 1.3V;  Someone else here will have a more exact answer for you since I don't have extensive experience with the 79XX/280(X) cards.
  • I highly doubt the card is voltage locked.  If it were hardware limited you wouldn't be able to adjust the setting in an OC program.  I experienced this with an XFX 7950 I briefly owned.

What program are you using to OC?  If it is Trixx make sure you have ULPS disabled and 'Force Constant Voltage' checked in the options tab.  If you are using AfterBurner I suggest giving Trixx a shot as well.




You must be adding a decent amount of voltage to the memory, it is rare to see VRM2 hotter than VRM1.

Thanks!!! +rep

The only reason I started messing with MVDDC (which I assume is memory voltage) is because VDDC wouldn't go over 1.191, no matter what I set. I tried Trixx but switch to MSI. If I didn't touch the MVDDC I could barely get over 1600 on the memory. I'll try thy disabling ULPS and 'Force Constant Voltage' but I could live with the card if memory voltage isn't too high. .051 over stock. I probably could lower it a little also.
post #5294 of 9745
Quote:
Originally Posted by boot318 View Post


Thanks!!! +rep

The only reason I started messing with MVDDC (which I assume is memory voltage) is because VDDC wouldn't go over 1.191, no matter what I set. I tried Trixx but switch to MSI. If I didn't touch the MVDDC I could barely get over 1600 on the memory. I'll try thy disabling ULPS and 'Force Constant Voltage' but I could live with the card if memory voltage isn't too high. .051 over stock. I probably could lower it a little also.

 

You're welcome!

 

The force constant voltage might get you a little more OC on the core, hard to say for sure until you give it a go.

 

I don't think you're really hurting anything on the memory with .051V additional.  I was surprised to see VRM2 hotter than VRM1

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post #5295 of 9745
Couple of weeks on VDDC of 1.412V. Card still running strong. No thermal throttling what so ever, no glitches, no hicups. Fan speed locked at 50% max and not exceeding 75°C. After some considerable testing it's safe to assume the 270x at clock speeds above 1350MHz on the core matches or comes near to match a stock out of the box 280x/7970GHZ.
post #5296 of 9745
Quote:
Originally Posted by Arkanon View Post

Couple of weeks on VDDC of 1.412V. Card still running strong. No thermal throttling what so ever, no glitches, no hicups. Fan speed locked at 50% max and not exceeding 75°C. After some considerable testing it's safe to assume the 270x at clock speeds above 1350MHz on the core matches or comes near to match a stock out of the box 280x/7970GHZ.

 

I would agree to it coming near 280X stock speeds.  Just did some benching on my 270X Devil and a VisionTek 280X.  For FFXIV benchmark, my card at 1260/1565 scored 90% as high as the stock 280X.

 

It is safe to say that a well clocked 270X can easily match/best a 7950/280 at stock speeds.

 

P.S.  You must have one hell of a 270X to hit 1350 :lmaosmile Got some pics?

 

What card/cooler is that to not exceed 75C at that voltage/clocks and only 50% fan speed?  My 270X at 1260/1565 1.3V was hitting 72C in 3DMark11 with fans at 80%

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post #5297 of 9745
Quote:
Originally Posted by Roboyto View Post

Well...only other thing I can think of is driver version.  Are you on a beta 14.X?  They are still a little buggy, but 13.12 is solid.

Otherwise, you may have simply hit the limit for your card on the RAM clock.

Black screen is definitely caused by too high of a memory clock from my experience, may just have to back it off a little bit unfortunately.

Only differences I ever seen was flashing my rev01 card to rev02 BIOS, which allowed trixx voltage slider to go up 1.3v from 1.256b. However after applying 1.3v, I could not get any better results with the core overclock so I assume it doesn't actually apply 1.3v and my limit is 1.256v
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post #5298 of 9745
After 4 months on this thread, finally bothered myself enough to do a screencap. Can I join?

post #5299 of 9745
Quote:
Originally Posted by Roboyto View Post

You're welcome!

The force constant voltage might get you a little more OC on the core, hard to say for sure until you give it a go.

I don't think you're really hurting anything on the memory with .051V additional.  I was surprised to see VRM2 hotter than VRM1

It finally work! I don't know how to feel having to force constant voltage but I don't have AB apply the overclock when I boot anyway. Kinda strange because at 1.25v with core @1200, under load I see the VDDC around 1.20-1.21. Poor components or is that normal for an GPU? Makes me want to set the VDDC to 1.3 and go for maximum overclock since I know the memory can be pushed harder than 1700.
post #5300 of 9745
Quote:
Originally Posted by Roboyto View Post

You may have just hit the limit of your card honestly, you have to figure the 270X is still a 7870 which stock are 1000 core clock. Getting to 1200 is a 20% boost, which is a respectable OC. I have had cards that get far less than 20%. You're just seeing less of the overclock capabilities because your card came with an overclock of 1100 MHz already.

My ASUS DC2 only got a little further than your clocks with similar voltage while being fully water cooled. I don't know how many of these cards get very far far past 1200.

The core speed is much more important on these cards. If you have Overclocked the RAM, reducing it back to stock speeds might help you push the core a little further.

I've been trying to locate a picture of the heatsink on that card and I can't find one. You may want to remove the heatsink to see if/how it is cooling the VRM.

It looks like there are 8 screws in total to remove your HSF.


I checked on EK's CoolingConfigurator website and it does NOT look like your card has heatsinks on the VRMs, this is likely inhibiting your ability to overclock. The VRMs for core/board are marked with the yellow, there are 5 in total; the little black squares. The Orange one is the VRM for RAM, and this is less important. At the very least, the lack of heatsinks will reduce the longevity of the card.

CREATOR: gd-jpeg v1.0 (using IJG JPEG v80), quality = 90



If you're at 1.3V then you are likely pushing the limits of air cooling for the VRM, especially if your card does not have heatsinks on the VRM.

This is a picture of my devil with heatsink/fan removed, I have the heatsinks for VRM marked in yellow. Your card should look similar to this, but may not be exact. The Devil 270X has upgraded VRMs for enhanced OCing and stability.
CREATOR: gd-jpeg v1.0 (using IJG JPEG v80), quality = 95

If you want to add heatsinks it's not a terribly difficult procedure, would just have to make sure that they will clear the fins of the cooler.

It is surprising that the Vapor-X edition doesn't have VRM sinks, my HD4890 did thinking.gif

Sapphire support replied to my ticket. Here's what they said:

"Did you see VRM temp before for this card ? Some of model VRM temp information has been remove"

I'm wondering if I could install heatsinks on the VRMs cause the thermal pads (please correct me if I'm wrong since I don't know what they are, just taking a guess) presses on the VRMs.
The HSF looks like this
HSF (Click to show)

I read the RMA/warranty policy and it says:

1. Product Warranty will not be valid even if returned after purchased for the following cases:
- Products that are defaced or physically damaged and modified by customer.

2. GPU or ASIC device (VGA) is sensitive to thermal (heat) issue. The heat sink or fan is designed to meet the requirements for reliability of the product and the warranty is rendered invalid if the product is dismantled or the heat sink or cooler fan are removed as this may causes damage to the GPU or ASIC device . Non-compliance will cause the warranty of the product to be void and repair will be at the users cost.

Will Sapphire know if I removed the HSF? Or if I changed the thermal paste?
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