Different core speeds on Xeon X3350

[unkieb]

I bought a pre overclocked PC in 2008. X3350 overclocked to 3.2G. It crashed a few months ago and I had to reset BIOS. It has been stable since but not overclocked. I am an overclocking noob, but wanted to see if I could get back to prev stable overclock. I first increased FSB speed too much I think whilst aiming to get RAM back to rated 1066mhz. CPU went to 3.4G on all 4 cores and seemed ok in 3dmark but crashed 40 min into prime95 test. After that I reset the FSB to 400mhz and changed the ram multiplyer to 3:4. But now only 1 out of the 4 cores is operating at 3.2G in speccy, whilst others are 2.4 despite same settings. (reads as 3.2G in cpu-Z and in sandra).

Any idea what I have done and how to get all cores running at 3.2G?

(these readings are from speccy whilst Prime95 running)

Core voltage is 1.216
Thanks

Operating System
MS Windows 7 Ultimate 64-bit
CPU
Intel Xeon X3350 @ 2.66GHz 59 °C
Yorkfield 45nm Technology
RAM
4.0GB Dual-Channel DDR2 @ 533MHz (5-5-5-15)
Motherboard
ASUSTeK Computer INC. Rampage Formula (LGA775) 45 °C
Graphics
DELL S2409W (1920x1080@60Hz)
AMD Radeon HD 6900 Series
Hard Drives
977GB SAMSUNG SAMSUNG HD103UJ ATA Device (SATA) 20 °C
Optical Drives
HL-DT-ST BDDVDRW GGC-H20L ATA Device
ZCTIL NOX2BCL SCSI CdRom Device
Audio
ASUS Xonar DG Audio Device
CPU
Intel Xeon X3350
Cores 4
Threads 4
Name Intel Xeon X3350
Code Name Yorkfield
Package Socket 775 LGA
Technology 45nm
Specification Intel(R) Xeon(R) CPU X3350 @ 2.66GHz
Family 6
Extended Family 6
Model 7
Extended Model 17
Stepping 7
Revision C1
Instructions MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, Intel 64
Virtualization Supported, Enabled
Hyperthreading Not supported
Bus Speed 400.0 MHz
Rated Bus Speed 1599.9 MHz
Stock Core Speed 2666 MHz
Stock Bus Speed 333 MHz
Average Temperature 58 °C
Caches
L1 Data Cache Size 4 x 32 KBytes
L1 Instructions Cache Size 4 x 32 KBytes
L2 Unified Cache Size 2 x 6144 KBytes
Core 0
Core Speed 2399.8 MHz
Multiplier x 8.0
Bus Speed 400.0 MHz
Rated Bus Speed 1599.9 MHz
Temperature 59 °C
Thread 1
APIC ID 0
Core 1
Core Speed 2399.8 MHz
Multiplier x 8.0
Bus Speed 400.0 MHz
Rated Bus Speed 1599.9 MHz
Temperature 58 °C
Thread 1
APIC ID 1
Core 2
Core Speed 3199.7 MHz
Multiplier x 8.0
Bus Speed 400.0 MHz
Rated Bus Speed 1599.9 MHz
Temperature 56 °C
Thread 1
APIC ID 2
Core 3
Core Speed 2399.8 MHz
Multiplier x 8.0
Bus Speed 400.0 MHz
Rated Bus Speed 1599.9 MHz
Temperature 58 °C
Thread 1
APIC ID 3

RAM
Memory slots
Total memory slots 4
Used memory slots 2
Free memory slots 2
Memory
Type DDR2
Size 4096 MBytes
Channels # Dual
DRAM Frequency 533.3 MHz
CAS# Latency (CL) 5 clocks
RAS# to CAS# Delay (tRCD) 5 clocks
RAS# Precharge (tRP) 5 clocks
Cycle Time (tRAS) 15 clocks
Command Rate (CR) 2T
Physical Memory
Memory Usage 70 %
Total Physical 3.99 GB
Available Physical 2.62 GB
Total Virtual 7.99 TB
Available Virtual 7.99 TB
SPD
Number Of SPD Modules 2
Slot #1
Slot #2

 

[unkieb]

Ok. Turned everything off, unplugged and let it cool down. (had rebooted before but was probably still warm). Now all running at 3.2G.

I did mention that i'm a noob

 

[muddasser_1980]

Hi,

I have done a bit of testing using speccy and it seems if the core speeds reported are different from one core to another, this is because one of the cores has less resources assigned to it so it will not be required to run at full speed. If you prime 95 your computer and re launch speccy, it will show the correct values.

Hope this helps.