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EVGA X58 BIOS - Functions - Settings - Voltages - Overclock

post #1 of 5
Thread Starter 
I'm currently learning how to overclock; and it seems like I have read almost every guide and post out there. I ran across an article from AnandTech describing the EVGA X58 Classified motherboard and found it very helpful. It clearly describes the various BIOS functions and voltage settings in relation to overclocking the i7 920.

Here is an excerpt on voltages along with a link to the article...

http://www.anandtech.com/print/2727

Quote:


CPU VTT: Stock VTT voltage defaults to 1.17V or so. The scale runs in 10mv steps, allowing you to add or subtract from the base value. VTT voltage drives the integrated memory controller and the QPI link bus. This voltage will need to be increased as you increase memory frequency and increase BCLK (QPI frequency). Remember to keep this voltage within 0.5V of VDIMM to prevent damage to the integrated memory controller.


CPU PLL VCore: 1.8V base; we found no benefits to increasing this voltage for overclocking. Clean power to PLL circuits is essential for ensuring that external influences over the accuracy of clock signals is minimized. It seems EVGA have done a good job with regards to all PLL voltage rails on the Classified. In terms of overclocking headroom and PLL's, clean power always trumps more voltage, thus there's no need to tinker with these voltages to any great extent on this board, apart from perhaps QPI PLL. Even then, you'll probaby find the level of voltage required for maximum BCLK potential is far below what some other boards need to get the same clocks.


IOH PLL VCore: Input/Output Hub Phase Locked Loop voltage. The default voltage is 1.8V. For the most part this voltage can be left at stock unless chasing maximum QPI frequencies for benchmarking. For 24/7 use we recommend you stick with a maximum of 1.89V. Processors/IOHs needing more than 1.89V to remain stable are best run at a lower BCLK and higher CPU multiplier to bring them back into their comfort zone.


QPI PLL VCore: Quick Path Interconnect Phase Locked Loop voltage. For 24/7 overclocking this voltage can be left at stock in most instances. Again, if you need to use more it's probably wise to pull back a little on QPI frequency to a speed that requires no more than 1.2V. For benchmarking, we used 1.45V to reach 239 BCLK for a CPU-Z shot.


IOH VCore: Input/Output Hub voltage uses a 1.10V base. Stock values usually suffice for 24/7 overclocking even when using multiple graphics cards; we had no problems in reaching a stable 200 BCLK X20 for 4GHz CPU speed. For more extreme QPI frequencies this voltage will need to be increased. For 3D benchmarking past 220 BCLK we used 1.45V. We needed 1.50V to reach 239 BCLK. Values over 1.50V failed to POST or locked up in the OS; use only as much voltage as you need.


IOH/ICH I/O Voltage: IOH to Intel Southbridge termination voltage. We left this voltage at stock and did not see any overclocking improvements from increasing it on this board. Base value is 1.50V.


ICH VCore: 1.05V base voltage; again this voltage can be left at default.


NF200 Voltage: 1.2V stock. We left this voltage at stock for all overclocking.


VTT PWM Frequency: Changes the switching frequency of the VTT voltage line. Higher switching frequencies can help facilitate lower output ripple, and reduce overshoot while providing a higher frequency power bandwidth to the CPU. Setting a higher frequency with this BIOS option may improve overclocking headroom somewhat depending on the current drawn. For overclocking past 220 BCLK we generally used 490KHz; for speeds below this a 250KHz switching frequency worked fine for us and also reduces the heat output from the PWM FETs.


CPU PWM Frequency: CPU PWM (VCore supply) switching frequency. Stock is 800KHz, which is more than sufficient for 99% of overclocking. For subzero benchmarking you may wish to increase the switching frequency to see if it helps stability during heavy 8-thread CPU loads. The side effect in doing so is increased heat from the power FETs, although the temperature increase is quite small due to the use of a 10-phase power delivery circuit, especially as the FETs are indirectly cooled via the CPU power plane when the processor temperature is well into the negative region.


CPU Impedance: Sets the level of signal compensation for the QPI bus to the CPU. Higher QPI frequencies often demand a higher signal current, which means that compensation levels have to be changed in order to counter any signal line reflections caused by PCB traces and input impedance mismatches. The options available for this function are AUTO and Less. On the Classified, we found that QPI frequencies approaching 4GHz can benefit from a reduction in the level of signal compensation, even more so if the CPU frequency is well above 4.5GHz. Leave at AUTO for most 24/7 overclocking at BCLKs under 200MHz. For subzero cooling at high system speeds, set this value to Less to see if it helps with overclocking headroom.


QPI Compensation: Sets the level of signal compensation for the QPI bus to the IOH. There are three options for this function, those being AUTO, Less, and More. We found that IOH compensation is far more sensitive to changes in compensation values than the CPU. A setting of Less for high BCLKs and QPI frequencies almost always brings about additional system stability during benchmarking (at least in our experience). For all other purposes, this value can be left to AUTO.

Edited by B-Con - 4/18/10 at 1:40pm
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BMW 932iA
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i7-920 D0 @ 4.0 GHz (1.28V) EVGA X58 3X SLI (E758) - BIOS: 83 EVGA GTX 780 Classified (344.11) 3 x 4 GB G.Skill Ripjaws Z 1600 MHz (7-8-8-22) 
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Samsung 840 Pro 256 GB + WD Caviar Black 1 TB Sony AD-7240S DVD RW Corsair H55 (GT AP-15 Pull + Shroud) Windows 7 Home Premium SP1 64-bit 
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ASUS PB278Q 27" LED 1440p ViewSonic VX2433wm 24" LCD 1080p Samsung LN46C630 46" LCD TV 1080p Logitech G510s 
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post #2 of 5
So... do you have a question or were you just excited to find that article?
     
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Crucial MX100 128GB SSD + 2x Seagate 3TB HDDs Koolance CPU-380i water block Windows 8.1 Pro 3x AOC 27" IPS monitors for 5760x1080 eyefinity 
PowerCase
Seasonic SS-760XP2 Lian Li PC-T60B test bench 
CPUMotherboardGraphicsRAM
AMD FX-8350 5GHz at 1.524v ASUS Crosshair V Formula-Z Sapphire R9 290X with EK water block 2x4GB G.Skill Trident X 2500MHz 9-11-11 1.68v  
Hard DriveCoolingOSMonitor
Crucial M4 64GB + 2x Seagate 3TB HDDs Koolance CPU-380A water block Windows 7 64-bit Home Premium 3x AOC 27" IPS monitors for 5760x1080 eyefinity 
PowerCase
Seasonic X 650 Gold Lian Li PC-T60B test bench 
CPUMotherboardGraphicsRAM
i7 2600K 4.4ghz @ 1.296v Asus Maximus IV Gene-Z XFX HD6950 shaders unlocked G.Skill ECO 2x2GB 1866MHz 7-9-7-25-1T @ 1.5v 
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post #3 of 5
I printed out the bios page explanation for my e760 off anandtech. very helpful. I was scared when I first got the mobo and didn't know what half the Voltages were.
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post #4 of 5
Thread Starter 
Quote:
Originally Posted by MrLinky View Post
So... do you have a question or were you just excited to find that article?
I'm always excited about everything.

Actually, I just achieved stability at 4.0 GHz. During my process I really couldn't find much information on IOH & ICH VCore, and how changing these settings would affect my overclock. From this article, it seems that IOH only needs to adjusted if you're running multiple graphics cards.
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CPUMotherboardGraphicsRAM
i7-920 D0 @ 4.0 GHz (1.28V) EVGA X58 3X SLI (E758) - BIOS: 83 EVGA GTX 780 Classified (344.11) 3 x 4 GB G.Skill Ripjaws Z 1600 MHz (7-8-8-22) 
Hard DriveOptical DriveCoolingOS
Samsung 840 Pro 256 GB + WD Caviar Black 1 TB Sony AD-7240S DVD RW Corsair H55 (GT AP-15 Pull + Shroud) Windows 7 Home Premium SP1 64-bit 
MonitorMonitorMonitorKeyboard
ASUS PB278Q 27" LED 1440p ViewSonic VX2433wm 24" LCD 1080p Samsung LN46C630 46" LCD TV 1080p Logitech G510s 
PowerCaseMouseMouse Pad
Chieftec Super Series 1000W Cooler Master HAF 932 Roccat Kone XTD (Laser) SteelSeries 4HD 
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BMW 932iA
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CPUMotherboardGraphicsRAM
i7-920 D0 @ 4.0 GHz (1.28V) EVGA X58 3X SLI (E758) - BIOS: 83 EVGA GTX 780 Classified (344.11) 3 x 4 GB G.Skill Ripjaws Z 1600 MHz (7-8-8-22) 
Hard DriveOptical DriveCoolingOS
Samsung 840 Pro 256 GB + WD Caviar Black 1 TB Sony AD-7240S DVD RW Corsair H55 (GT AP-15 Pull + Shroud) Windows 7 Home Premium SP1 64-bit 
MonitorMonitorMonitorKeyboard
ASUS PB278Q 27" LED 1440p ViewSonic VX2433wm 24" LCD 1080p Samsung LN46C630 46" LCD TV 1080p Logitech G510s 
PowerCaseMouseMouse Pad
Chieftec Super Series 1000W Cooler Master HAF 932 Roccat Kone XTD (Laser) SteelSeries 4HD 
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post #5 of 5
Gotcha. Yeah, multipule gpus or high bclks benifit from a little extra IOH voltage. I used that article when trying to hit 5ghz... pretty helpful
     
CPUMotherboardGraphicsRAM
i7 5960X 4.5GHz at 1.33V ASRock X99M Killer Sapphire 290X G.SKILL Ripjaws 4 2666MHz at 13-13-13-35-1T 1.33V 
Hard DriveCoolingOSMonitor
Crucial MX100 128GB SSD + 2x Seagate 3TB HDDs Koolance CPU-380i water block Windows 8.1 Pro 3x AOC 27" IPS monitors for 5760x1080 eyefinity 
PowerCase
Seasonic SS-760XP2 Lian Li PC-T60B test bench 
CPUMotherboardGraphicsRAM
AMD FX-8350 5GHz at 1.524v ASUS Crosshair V Formula-Z Sapphire R9 290X with EK water block 2x4GB G.Skill Trident X 2500MHz 9-11-11 1.68v  
Hard DriveCoolingOSMonitor
Crucial M4 64GB + 2x Seagate 3TB HDDs Koolance CPU-380A water block Windows 7 64-bit Home Premium 3x AOC 27" IPS monitors for 5760x1080 eyefinity 
PowerCase
Seasonic X 650 Gold Lian Li PC-T60B test bench 
CPUMotherboardGraphicsRAM
i7 2600K 4.4ghz @ 1.296v Asus Maximus IV Gene-Z XFX HD6950 shaders unlocked G.Skill ECO 2x2GB 1866MHz 7-9-7-25-1T @ 1.5v 
Hard DriveCoolingOSMonitor
Crucial M4 64GB + WD Black 1.5TB Apogee XT + MCP320 + MCP655-B Windows 7 x64 Home Premium + Linux Mint Debian Hanns G 28" 1920x1200 
PowerCase
Corsair VX550w Caseless 
  hide details  
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CPUMotherboardGraphicsRAM
i7 5960X 4.5GHz at 1.33V ASRock X99M Killer Sapphire 290X G.SKILL Ripjaws 4 2666MHz at 13-13-13-35-1T 1.33V 
Hard DriveCoolingOSMonitor
Crucial MX100 128GB SSD + 2x Seagate 3TB HDDs Koolance CPU-380i water block Windows 8.1 Pro 3x AOC 27" IPS monitors for 5760x1080 eyefinity 
PowerCase
Seasonic SS-760XP2 Lian Li PC-T60B test bench 
CPUMotherboardGraphicsRAM
AMD FX-8350 5GHz at 1.524v ASUS Crosshair V Formula-Z Sapphire R9 290X with EK water block 2x4GB G.Skill Trident X 2500MHz 9-11-11 1.68v  
Hard DriveCoolingOSMonitor
Crucial M4 64GB + 2x Seagate 3TB HDDs Koolance CPU-380A water block Windows 7 64-bit Home Premium 3x AOC 27" IPS monitors for 5760x1080 eyefinity 
PowerCase
Seasonic X 650 Gold Lian Li PC-T60B test bench 
CPUMotherboardGraphicsRAM
i7 2600K 4.4ghz @ 1.296v Asus Maximus IV Gene-Z XFX HD6950 shaders unlocked G.Skill ECO 2x2GB 1866MHz 7-9-7-25-1T @ 1.5v 
Hard DriveCoolingOSMonitor
Crucial M4 64GB + WD Black 1.5TB Apogee XT + MCP320 + MCP655-B Windows 7 x64 Home Premium + Linux Mint Debian Hanns G 28" 1920x1200 
PowerCase
Corsair VX550w Caseless 
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