Memory reset to default. How to OC?

On what system?

720

Boot into the bios and check to see if the option under memory for EPP/SLI is set to on. This is the only way to  Oc the memory on your system. Also note that the memory must be EPP/SLI ready or this will not work.

Pick up a copy of CPU-z and look at the memory tab and the SPD tab to see how all your memory is running.

 

 

Are you positive that your old memory was running a 1066?  If so it appears that dell did not send you the exact same memory as it is only running a 800mhz.

 

Here is something to try. Pull two sticks out and look at the memory tab in CPU-z. The important listing is the memory frequency. You need to double this as the memory is dual channel. So if it reports the freq at 400 then the memory is running at 800, like wise if it says 533 then the memory is running at 1066.

Also look at the timings that are listed on the memory tab and compare them to the timings that are listed on the SPD tab. This will tell what SPD the memory is running in and the voltage that it needs. If there is no listing on the SPD tab for EPP then your memory is not EPP/SLI certified.

 

right now yours is running a 800mhz.

Processor(s)

Number of processors 1
Number of cores 4 per processor
Number of threads 4 per processor
Name Intel Core 2 Quad Q6600
Specification Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
Package Socket 775 LGA
Family/Model/Stepping 6.F.B
Extended Family/Model 6.F
Core Stepping G0
Technology 65 nm
Core Speed 1600.2 MHz
Multiplier x Bus speed 6.0 x 266.7 MHz
Rated Bus speed 1066.8 MHz
Stock frequency 2400 MHz
Instruction sets MMX, SSE, SSE2, SSE3, SSSE3, EM64T
L1 Data cache (per processor) 4 x 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache (per processor) 4 x 32 KBytes, 8-way set associative, 64-byte line size
L2 cache (per processor) 2 x 4096 KBytes, 16-way set associative, 64-byte line size

Chipset & Memory

Northbridge NVIDIA nForce 680i SLI SPP rev. A2
Southbridge NVIDIA nForce 680i SLI MCP rev. A3
Graphic Interface PCI-Express
PCI-E Link Width x16
PCI-E Max Link Width x16
Memory Type DDR2
Memory Size 4096 MBytes
Memory Frequency 400.0 MHz (2:3)
CAS# Latency (tCL) 5.0 clocks
RAS# to CAS# (tRCD) 5 clocks
RAS# Precharge (tRP) 5 clocks
Cycle Time (tRAS) 18 clocks
Bank Cycle Time (tRC) 22 clocks
Command Rate (CR) 2T

System

System Manufacturer Dell Inc.
System Name Dell XPS720
Mainboard Vendor Dell Inc.
Mainboard Model 0P611C
BIOS Vendor Dell Inc.
BIOS Version A05
BIOS Date 01/03/2008

Memory SPD

Module 1 DDR2, PC2-6400 (400 MHz), 1024 MBytes, Corsair
Module 2 DDR2, PC2-6400 (400 MHz), 1024 MBytes, Corsair
Module 3 DDR2, PC2-6400 (400 MHz), 1024 MBytes, Corsair
Module 4 DDR2, PC2-6400 (400 MHz), 1024 MBytes, Corsair

Software

Windows Version Microsoft Windows Vista (6.0) Home Premium Edition Service Pack 1 (Build 6001)
DirectX Version 10.0