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Gigabyte HD7850 OC 2 Gb - Catalyst 13.1 WHQL Idle GPU memory still stuck at 1200 mhz / No ZeroCore Power

post #1 of 4
Thread Starter 
Hi, first of all apologize for my english, because it's not my native language.
The title of the thread says it almost everything.
The Gigabyte is the 7850 OC 2Gb version with core GPU overclocked from factory from 860 to 975 Mhz .
I've tried Catalyst v12.8, 12.10, 12.11 beta 6, 8 and 11, and since yesterday 13.1 WHQL, and in all of them the GPU core at idle lowers to 300 mhz but the memory clock get stucked in 1200 Mhz (should be 150 Mhz), so the VDDC doesn't lower from 0,90v and the temps at idle fluctuates between 40-42º c (where should be in order of 30º-35º c). The release notes of Catalyst 12.11 beta 6 says that this issue was especially resolved, but not for me.
I'm using as only output an analog LCD monitor connected through a DVI-VGA adapter, and I got an 32" LCD HDTV that connects via HDMI only when I need it (gaming, movies).
First I thought it was related to the settings of the BIOS of the GPU, but in AIDA64 shows the values of ATI PowerPlay (BIOS), I assume that it reads directly from GPU BIOS, and it shows:
State 1: GPU 860 Mem 1200 (Boot)
State 2: GPU 975 Mem 1200
State 3: GPU 860 Mem 1200 (UVD)
State 4: GPU 300 Mem 150

So it is clear that the driver doesn't allow the GPU memory clock to enter in the power state 4, .
Zerocore power isn't working (never worked really), so when the screen goes blank the GPU fans doesn't change its behavior and the temps doesn't decrease at all.
The BIOS version is 015.017.000.000.000861 (113-C4030400-100) dated 5/29/12.
The ambient temps indoors are here nearly 30º (summer) so the temps described before are a lot influenced by that .

Could someone give me any feedback for trying to resolve this issue?.
Thanks in advance.
post #2 of 4
The issue was resolved. Your GPU is behaving as expected.

You can only get the 300/150 clock on a Radeon if you have one display ONLY, or all displays are identical and connected with a display that supports a TMDS signal (HDMI/DVI). Otherwise full-speed VRAM is required to provide the bandwidth needed maintain flicker-free drawing of the Windows desktop

Therefore, with two displays connected, and a 300MHz GPU clock, your GPU is entering into the correct idle clocks for your GPU configuration.
post #3 of 4
Thread Starter 
Thanks alot for answering. I understand what you said, that the memory clock fixed at 1200 mhz is needed to keep two displays working at the same time, the problem is that I was only using the LCD analog monitor (the HDTV is phisically connected only for playing games or watch movies), in fact the first time I installed the drivers (all of them from 12.8 to 13.1, clean install) the only display attached to the card was the LCD monitor, through an DVI-VGA adapter, and the card doesn't lower the memory clock from 1200 Mhz or the VDDC from 0,90v.
By the way my card have the following outputs: DVI-D - HDMI and DisplayPortx2
Could it be that using an analog LCD monitor through an adapter is interpreted by the card like using dual screens at difference if the monitor was directly digital DVI?
All comments are welcome.
Thanks
post #4 of 4
I'm using powercolor 7850 with a single DVI monitor ... the 1200mhz or 4800 vram is bugged too even when I don't have any browser opened.
It's been this way since I bought it last October.
Skylake2016
(13 items)
 
  
CPUMotherboardGraphicsRAM
intel i5-6600k 4.62ghz 1.36v adaptive LLC 4 asus z170 pro gaming powercolor 7850 2gb @ 30% OC 8+8gb corsair 2400mhz CL14 
Hard DriveHard DriveCoolingOS
samsung 850 240gb SSD 2 TB seagate HDD Phanteks tc14pe with noctua 140mm 1500rpm middl... win7 x64 
MonitorKeyboardPowerCase
Qnix qx2710 matte 1440p CoolerMaster tenkeyless cherry brown +o-rings EVGA P2 650w platinum ikonik en2 140+140(stock fans from cooler) +1... 
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Skylake2016
(13 items)
 
  
CPUMotherboardGraphicsRAM
intel i5-6600k 4.62ghz 1.36v adaptive LLC 4 asus z170 pro gaming powercolor 7850 2gb @ 30% OC 8+8gb corsair 2400mhz CL14 
Hard DriveHard DriveCoolingOS
samsung 850 240gb SSD 2 TB seagate HDD Phanteks tc14pe with noctua 140mm 1500rpm middl... win7 x64 
MonitorKeyboardPowerCase
Qnix qx2710 matte 1440p CoolerMaster tenkeyless cherry brown +o-rings EVGA P2 650w platinum ikonik en2 140+140(stock fans from cooler) +1... 
Mouse
Logitech 402 
  hide details  
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