GA-EP35C-DS3R / Q6600 / 2x4GB DDR3 1600 - cant oc

[sford]

Hi Guys,

I've had this system for 3 years.
I used to have 4GB (2x2GB) of CORSAIR DOMINATOR 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) in my GA-EP35C-DS3R / Q6600.
I could overclock that, completely stable, to 3.6GHz.
I needed to go to 8GB, so I added 2 more of the CORSAIR DOMINATOR. I could still overclock, but only to 3.4Ghz, and only with +.5 Mem Overvolt and +.3 northbridge.
And I got occasional blue screens. Mem test iso also reported errors.

So, I bought G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) hoping I'ld get complete stability.

But now I cant overclock at all. If I try to go over 2.4, the system multi-reboots and goes back to 2.4.

I've tried more voltage (CPU, memory, northbridge), and dropping DRAM timing down to 2.0 (as well as trying it at auto) and setting timing to 10,10,10,28

But nothing is working.

Can I not overclock this system any more?

Thanks for any thoughts....

G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL (9,9,9,24 1.5v)
Newegg.com - G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL


MoBo GIGABYTE GA-EP35C-DS3R LGA 775 Intel P35 ATX Dynamic Energy Saver Ultra Durable II Intel Motherboard
CPU Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Quad-Core Processor Model BX80562Q6600 (G0)
MEM CORSAIR DOMINATOR 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model TWIN2X4096-8500C5D - Retail
GRPHX Sapphire Radeon HD 5770, 1 GB DDR5 Dual DVI-I / HDMI / DP PCI-Express Graphics Card 100283L
CASE Antec Nine Hundred Black Steel ATX Mid Tower Computer Case
PSU CORSAIR CMPSU-850TX 850W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready





Robust Graphics Booster___________ [Auto]
CPU Clock Ratio ____________ [9]
Fine Clock Ratio ____________ dont have this
CPU Host Clock Control_ [Enabled]
CPU Host Frequency (MHz)__________ [378] would like any over clock to work.....
PCI Express Frequency (Mhz)_______ [AUTO]
C.I.A. 2__________________________ [Disabled]
System Memory Multiplier (SPD)____ [2.00]
DRAM Timing Selectable_______ SPD __ [Manual]

Performance Enhance = [Standard]

CAS Latency Time________________ 9
Dram RAS# to CAS# Delay_________ 9
Dram RAS# Precharge Delay_______9
Precharge Delay (tRAS)__________ 12

ACT to ACT Delay (tRRD)_________ ?
Rank Write to READ Delay________ ?
Write to Precharge Delay_________ ?
Refresh to ACT Delay______________ ?
Read to Precharge Delay__________ ?
Static tRead Value_______________
Static tRead Phase Adjust________ [Auto]

CPU/PCIEX Clock Driving Control [800mV]
CPU Clock Skew Control [normal]
GMCH Clock Skew Control [Normal]

System Voltage Control____ [Manual]
DDR2 OverVoltage Control__ [+0.4V]
PCI-E OverVoltage Control_ [+0.2V]
FSB OverVoltage Control___ [+0.2V]
(G)MCH OverVoltage Control [+0.2V]
CPU Voltage Control_______ [1.375]

Limit CPUID Max. to 3.....................: [Disabled]
No-Execute Memory Protect............: [Enabled]
CPU Enhanced Halt (C1E)................: [Disabled]
C2/C2E State Support....................: [Disabled]
x C4/C4E State Support..................: [Disabled]
CPU Thermal Monitor 2(TM2) ...........: [Enabled]
CPU EIST Function.........................: [Disabled]
Virtualization Technology................: [Enabled] Enabled if you use Vmware/Virtual PC

Integrated Peripherals
Legacy USB Storage Detect___________________[Disabled] *Note* Must be enabled to flash from USB

[Chike]

Re: GA-EP35C-DS3R / Q6600 / 2x4GB DDR3 1600 - cant oc

DDR2 OverVoltage +0.4? Why?
And tRAS 12 is a typo?
Try 333MHz FSB with CPU Ratio 7 and SMM 4 for DDR-1333, see if you can get that to work or SMM 3.2 for DDR-1066.
The ram should not need more than 1.6v.

[sford]

Re: GA-EP35C-DS3R / Q6600 / 2x4GB DDR3 1600 - cant oc

DDR2 OverVoltage +0.4? Why?
And tRAS 12 is a typo?
Try 333MHz FSB with CPU Ratio 7 and SMM 4 for DDR-1333, see if you can get that to work or SMM 3.2 for DDR-1066.
The ram should not need more than 1.6v.

the manual for the GA-ep35c says the voltage for the 4 DDR2 slots is 1.8v. The Corsair memory says it likes 2.1v. So I ran the 2x2gb at +.3 to go from the supplied 1.8 to the requested 2.1. When I put in the second 2 sticks, I thought it might need another .1 for stability.

Yes, tRAS is a typo - it should be 24, not 12. I should've been an economist....
I'll give your thoughts a shot - thanks for the help!

[Chike]

Re: GA-EP35C-DS3R / Q6600 / 2x4GB DDR3 1600 - cant oc

Older DDR3 required 1.8v.
DDR3 standard is 1.5v +- 0.075v, some(newer ram still need 1.6-1.65v but those sticka are rated for 1.5 so maybe 1.6 not more.