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i7 3820 - 4820 Overclock Club - Page 293

post #2921 of 6491
Hey guys, how would one stabilize a BCLK overclock?

I'm pretty sure bumping this up to 125 MHz has made my GPU unstable. Too many megahertz through the PCI bus!
post #2922 of 6491
Thread Starter 
Quote:
Originally Posted by Snuckie7 View Post

Hey guys, how would one stabilize a BCLK overclock?

I'm pretty sure bumping this up to 125 MHz has made my GPU unstable. Too many megahertz through the PCI bus!
Try upping your cpu vcssa volts to 1.25 and cpu vtt volts 1.25 as well 2nd vtt volts on auto give it a go post back with your results thumb.gif
post #2923 of 6491
Hmm my BIOS seems to be lacking those options (or has them under a different name)
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post #2924 of 6491
Thread Starter 
What clock are you running first ?
post #2925 of 6491
36 multi x 125 MHz BLCK, so 4.5 GHz. Core voltage is 1.252V right now (the settings above aren't mine)
post #2926 of 6491
Thread Starter 
Quote:
Originally Posted by Snuckie7 View Post

36 multi x 125 MHz BLCK, so 4.5 GHz. Core voltage is 1.252V right now (the settings above aren't mine)
Vscca = Vccio and Cpu vsa = Cpu Vtt but on that clock I doubt you will need to . Knock up the vcore a tad first
post #2927 of 6491
Quote:
Originally Posted by HOMECINEMA-PC View Post

Vscca = Vccio and Cpu vsa = Cpu Vtt but on that clock I doubt you will need to . Knock up the vcore a tad first

Ok nice that's what I thought (bumped VCCSA to 1.25 and VCCIO to 1.20)

My CPU is stable (passed 13 hours of P95), but I think the increased BCLK frequency made my GPU unstable.
post #2928 of 6491
Thread Starter 
With the gpu are you running the lataest drivers and stuff ?
post #2929 of 6491
7950 with the latest 13.3 beta drivers.

The crashing didn't happen until I bumped my CPU up to 4.5GHz so I'm pretty sure it's that.
post #2930 of 6491
Quote:
Originally Posted by Snuckie7 View Post

Hey guys, how would one stabilize a BCLK overclock?

I'm pretty sure bumping this up to 125 MHz has made my GPU unstable. Too many megahertz through the PCI bus!
If you use CPU/BCLK Strap 125, the PCIe bus remain 100MHz. CPU has 4 straps; 100, 125, 167, 250 where ratio are 1:1, 1:1.25, 1:1.67, 1:2.5 respectively.

If you set 125 BCLK Strap & 125 BCLK, 125MHz is given to CPU. PCIE = 125 / 1.25 = 100MHz.

If you set 125 BCLK Strap & 127 BCLK, 127MHz is given to CPU. PCIE = 127 / 1.25 = 101.6MHz

Make sure you set CPU/BCLK Strap & BCLK accordingly.
Edited by kizwan - 3/31/13 at 10:34pm
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Superhero Effect
(26 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core i7-3820 @4.7GHz Asus P9X79 PRO 2 x Sapphire R9 290 4GB GDDR5 Corsair Vengeance CMZ16GX3M4X1600C9 (16GB) 
Hard DriveHard DriveOptical DriveCooling
WD WD6400AAVS 640GB 8MB SATA-II Caviar Green 2 x Plextor PX-M5S 128GB (RAID0) Liteon 12x Blu-ray Drive COMBO 2 x (EK-FC R9-290X - Acetal, EK-FC R9-290X Back... 
CoolingCoolingCoolingCooling
Koolance Ball Valve VLV-BL1X2 XSPC D5 Dual Bay Reservoir/Pump Combo Hardware Labs Black Ice GT Stealth 360mm Hardware Labs Black Ice SR-1 120 
CoolingCoolingCoolingCooling
XSPC EX240 2x120mm radiator 5 x Corsair SP120 High Performance 2 x Corsair SP120 PWM High Performance XSPC Raystorm 
CoolingCoolingOSMonitor
NZXT Sentry 2 fan controller PrimoFlex Advanced LRT 10ft Tubing - 7/16in. ID... Windows 10 Home 64-bit Samsung SyncMaster B2330H 23" 
MonitorKeyboardPowerCase
Philips 236G3DHSB 3D LCD LED 23" Razer BlackWidow Ultimate Seasonic X-1050 1050W Corsair Vengeance C70 Mid-Tower Gaming Case Gun... 
MouseAudio
Razer Imperator 2012 Realtek ALC898 8-Channel High Definition Audio ... 
CPUMotherboardGraphicsRAM
Intel Core i7 720QM Dell Studio 1557 Intel PM55 ATI Mobility Radeon HD 4500/5100 Series Samsung 2GB DDR3-1333 
RAMHard DriveOptical DriveCooling
Samsung 2GB DDR3-1333 Seagate ST9320325AS HL-DT-ST_DVD+-RW_GA11N Fan + Copper + Aluminum + Shin-Etsu G751 
OSMonitorKeyboardPower
Windows 7 Home Premium 64-bit 15.6" LCD (WXGA) InnoLux BT156GW01 Dell Studio 1557 Keyboard Dell 90W AC Adapter 
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IDT High Definition Audio CODEC 
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