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Whats the stock voltage on r9 290's?

post #1 of 6
Thread Starter 
I want to downclock my graphics card, its the pcs 290, i know it has core clock 1040 and mem clock 1350
its my first time trying to mess with clock speeds on hardware, i have seen a tutorial on overclocking and i understand how its done,
thing is how would you change voltages if reducing clock speeds?

i have just installed beta msi afterburner, unlocked the voltage, its at zero headscratch.gif

not sure if i should reduce voltage? if i reduce the clocks i should reduce voltage right?

heres a screenie


should i reduce aux voltage as well if reducing clock speeds?
post #2 of 6
Stock VID varies considerably from sample to sample.

The voltage settings in MSI AB are offsets. Stock is 0, and + or - settings increase or decrease voltage relative to stock.

If you are underclocking the card, you can almost always get away with reducing core voltage a fair bit. I would not bother with Aux voltage, as even small changes can result in instability, and power difference is minor. Still, -6mv is usually safe.
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post #3 of 6
Thread Starter 
if i underclock say from 1040 down to 1000 core clock

and memory clock 1350 up, whats the rule with increasing voltage and decreasing? im just not sure how i should change the voltage according to much i decrease core clock and increase memory clock unless that balances things out?

i did try reduce core clock to 1000Mhz and everything seems fine, i ran unigine valley benchmark while i was doing it, but i havent changed the memory clock

im just not sure how i should undervolt the card, or if it should be done
post #4 of 6
There is no real rule, other than that of diminishing returns. You are going to need to experiment and stress test to find the lowest stable voltages at a given clock speed. Every part is different.

Higher memory clocks do tend to need more core voltage, so this may negate some of the reductions you can see from reducing core clock.

What is your goal with this card? What are you using it for?
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post #5 of 6
Thread Starter 
im using it for mining, some gaming but i dont mind having lowered clock speeds just so i can hash better,

i seen alot of gpu configs for mining they always have core clock somewhere around 1000 and memory clock close to or near 1500
my gpu is running stock 1040 core and memory at 1350

i was thinking if i reduce the core clock down to 1000 i could increase memory clock without changing voltage?
post #6 of 6
Quote:
Originally Posted by DrClaw View Post

i was thinking if i reduce the core clock down to 1000 i could increase memory clock without changing voltage?

For mining, almost certainly.
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5820K @ 4.3/3.6GHz core/uncore, 1.225/1.2v Gigabyte X99 SOC Champion (F22n) 2x Sapphire R9 290X Tri-X OC New Edition (10036... 4x4GiB Crucial @ 2667, 12-11-12-27-T1, 1.37v 
Hard DriveHard DriveHard DriveCooling
Plextor M6e 128GB (fw 1.05) M.2 (PCI-E 2.0 2x) 2x Crucial M4 256GB 4x WD Scorpio Black 500GB Cooler Master Nepton 280L 
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Fractal Design Define R4 Logitech G402 Realtek ALC1150 + M-Audio AV40 
CPUMotherboardGraphicsRAM
X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Reference R9 290X w/Stilt's MLU 1000e / 1375m E... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
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CoolingOSPowerCase
Noctua NH-D14 Windows 7 Pro x64 SP1 Antec TP-750 Fractal Design R5 
Audio
ASUS Xonar DS 
CPUMotherboardGraphicsRAM
i7-6800K @ 4.3/3.5GHz core/uncore, 1.36/1.2v ASRock X99 OC Formula (P3.10) GTX 780 (temporary) 4x4GiB Crucial DDR4-2400 @ 11-13-12-28-T2, 1.33v 
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