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GTX 560 Ti Overclocking

post #1 of 2
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My friend has 2 560 Tis (Gigabyte Windforce editions).

When he was overclocking his GPU to find out what his max clocks at a certain voltage, he found out that his cards were stable at 980CORE and 4400MEM (QDR), but weren't stable at 980CORE and 4300MEM.

Can anyone explain why wasn't his card stable at lower memory clocks? Perhaps there's a certain ratio that should be regarding core clock and memory clock?
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Refined
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CPUMotherboardGraphicsRAM
4770k GIGABYTE Z97X-UD3H-BK MSI R9 290 w/ Gelid Icy Vision Rev. 2 G.SKILL Sniper 2x8GB DDR3-2133 
Hard DriveHard DriveOptical DriveCooling
Seagate 1TB 7200RPM SATA II HDD Crucial MX300 1050GB Disconnected Noctua NH-C14 
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Windows 8.1 PRO x64 DELL U2312HM Teac SeaSonic S12II-620 80PLUS BRONZE 
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TMS Custom Built LIMITED EDITION Microsoft 
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post #2 of 2
It's a shot in the dark, but it should be related to memory timings. When OCing the motherboard memory, you can specify what frequency and what timings he wants to use. Graphics memory have timings and sub-timings just as regular DDR2/3 does, just that you never see them. These are hard coded in card's BIOS and in your case what may have happened is that @4.3 it has some timings, but @4.4 they're looser which makes them stable even though the clock is higher (similar to something like DDR3 6-6-6-18 @1600 unstable, but stable @1660 7-7-7-21). Since changing timings is automatic you can't easily modify at which level it happens, the only way is to edit the BIOS - which on ATI cards it is possible with RBE; for Nvidia cards the soft to use is Nibitor
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Centurion
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