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At this point in time, Wattman does not support memory underclocking .
Thanks for the info, Ray.
For the moment I downgrade to 16.11.2 which is working absolutely fine for my situation.
I just hope the AMD Engineering wizards will address this memory speed issue in future releases....
(As it seems, I have more or less been duplicating the question about this subject. Sorry for that)
I have same problem, and original topic include not real solution and closed now. I tried MSI Afterburner too for memory underclocking to 1100 MHz (this is a stable frequency for my card), but I get blank screen after save settings.
I have an R7 260X card with this hardware:
Graphics Card Manufacturer - Powered by AMD
Graphics Chipset - AMD Radeon R7 200 Series
Device ID - 6658
Vendor ID - 1002
SubSystem ID - 2271
SubSystem Vendor ID - 1458
Revision ID - 00
Bus Type - PCI Express 3.0
Current Bus Settings - PCI Express 3.0 x16
BIOS Version - 015.040.000.000
BIOS Part Number - xxx-xxx-xxx
BIOS Date - 2013/09/27 06:22
Memory Size - 2048 MB
Memory Type - GDDR5
Memory Clock - 1625 MHz
Core Clock - 1188 MHz
Total Memory Bandwidth - 104 GByte/s
Memory Bit Rate - 6.50 Gbps
I NEED REAL underclocking system for my card IN WATTMAN!