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Need help to figure this out

post #1 of 4
Thread Starter 
I might be stuck due to the board limitations, but hopefully someone out there understands this.

I have an Intel 975XBX MB, E6600 proc, and Corsair ddr-800 memory (PC6400).

The memory is supposed to run at 4-4-4-12.

According to CPU-Z, the bus speed is 266.7Mhz, and the rated FSB is 1066.7Mhz

On the CPU-Z memory page, it recognizes the 4Gb of ram, and the SPD page shows ram in all four slots and on the SPD page, it shows the timings per the ram specs of 4-4-4-12.

Now my question:

On the CPU-Z memory tab, it shows memory frequency is 400Mhz and that FSB:RAM ratio is 2:3. CAS Latency is 5 clocks.

Would someone who understands this please diagnose? Since it's DDR2 ram, does the frequency of 400Mhz mean the memory is actually running at the 800Mhz the memory is spec'd at? If so, or even if not, why is latency 5 clocks--I thought it would be 4. And please translate the 2:3 FSB/ram ratio.

I don't think I can change anything because of the intel board. If there is something I should be doing to improve this, though, please let me know. Thanks.
My System
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7-3770k 3.5Ghz LGA1155 ASUS P8Z77-V Deluxe EVGA GeForce GTX 680 Classified 4 GB DDR5 Corsair Vengeance 4 x 8GB PC3 17000 DDR3 2133MHz 
Hard DriveOptical DriveOptical DriveCooling
Dual Kingston HyperX 3K 240 GB SATA III 6.0 Gb/... Pioneer BDR-207DBKS Black 12X SATA Blu-ray Driv... Asus Black 12X BD-ROM 16X DVD-ROM 48X CD-ROM SA... Zalman CNPS9500A LED CPU Cooler 
OSMonitorKeyboardPower
Windows 7 Samsung B350 S27B350H 27-Inch Screen LED-Lit Mo... Logitech G19 Programmable Gaming Keyboard SilverStone ATX12V/EPS12V 1000W 
CaseMouseAudioOther
Cooler Master HAF 932 Advanced Full Tower Case Logitech Wireless Performance Mouse MX Creative Sound Blaster Recon3D THX PCIE Fatal1t... Atech Flash Pro-55U Internal Flash Memory Card ... 
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My System
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7-3770k 3.5Ghz LGA1155 ASUS P8Z77-V Deluxe EVGA GeForce GTX 680 Classified 4 GB DDR5 Corsair Vengeance 4 x 8GB PC3 17000 DDR3 2133MHz 
Hard DriveOptical DriveOptical DriveCooling
Dual Kingston HyperX 3K 240 GB SATA III 6.0 Gb/... Pioneer BDR-207DBKS Black 12X SATA Blu-ray Driv... Asus Black 12X BD-ROM 16X DVD-ROM 48X CD-ROM SA... Zalman CNPS9500A LED CPU Cooler 
OSMonitorKeyboardPower
Windows 7 Samsung B350 S27B350H 27-Inch Screen LED-Lit Mo... Logitech G19 Programmable Gaming Keyboard SilverStone ATX12V/EPS12V 1000W 
CaseMouseAudioOther
Cooler Master HAF 932 Advanced Full Tower Case Logitech Wireless Performance Mouse MX Creative Sound Blaster Recon3D THX PCIE Fatal1t... Atech Flash Pro-55U Internal Flash Memory Card ... 
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post #2 of 4
Since you are running a divider your RAM will be faster then your CPU but it shouldn't be that much higher. I think it may be a CPU-Z error.
I <3 480's
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8600 ASUS P5Q PRO Turbo Evga GTX 480 4GB OCZ Platinum 
Hard DriveOSMonitorPower
x2 30GB Vertex SSD in RAID0, 120GB WD Windows 7 Ultimate 64 bit 19" Dell LCD Corsair TX750 
Case
Cheap Rosewill 
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I <3 480's
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8600 ASUS P5Q PRO Turbo Evga GTX 480 4GB OCZ Platinum 
Hard DriveOSMonitorPower
x2 30GB Vertex SSD in RAID0, 120GB WD Windows 7 Ultimate 64 bit 19" Dell LCD Corsair TX750 
Case
Cheap Rosewill 
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post #3 of 4
Thread Starter 
Well, I'm not running anything that wasn't put there automatically by the system, it's 100% stock settings, I haven't changed a thing in the BIOS.
My System
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7-3770k 3.5Ghz LGA1155 ASUS P8Z77-V Deluxe EVGA GeForce GTX 680 Classified 4 GB DDR5 Corsair Vengeance 4 x 8GB PC3 17000 DDR3 2133MHz 
Hard DriveOptical DriveOptical DriveCooling
Dual Kingston HyperX 3K 240 GB SATA III 6.0 Gb/... Pioneer BDR-207DBKS Black 12X SATA Blu-ray Driv... Asus Black 12X BD-ROM 16X DVD-ROM 48X CD-ROM SA... Zalman CNPS9500A LED CPU Cooler 
OSMonitorKeyboardPower
Windows 7 Samsung B350 S27B350H 27-Inch Screen LED-Lit Mo... Logitech G19 Programmable Gaming Keyboard SilverStone ATX12V/EPS12V 1000W 
CaseMouseAudioOther
Cooler Master HAF 932 Advanced Full Tower Case Logitech Wireless Performance Mouse MX Creative Sound Blaster Recon3D THX PCIE Fatal1t... Atech Flash Pro-55U Internal Flash Memory Card ... 
  hide details  
Reply
My System
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7-3770k 3.5Ghz LGA1155 ASUS P8Z77-V Deluxe EVGA GeForce GTX 680 Classified 4 GB DDR5 Corsair Vengeance 4 x 8GB PC3 17000 DDR3 2133MHz 
Hard DriveOptical DriveOptical DriveCooling
Dual Kingston HyperX 3K 240 GB SATA III 6.0 Gb/... Pioneer BDR-207DBKS Black 12X SATA Blu-ray Driv... Asus Black 12X BD-ROM 16X DVD-ROM 48X CD-ROM SA... Zalman CNPS9500A LED CPU Cooler 
OSMonitorKeyboardPower
Windows 7 Samsung B350 S27B350H 27-Inch Screen LED-Lit Mo... Logitech G19 Programmable Gaming Keyboard SilverStone ATX12V/EPS12V 1000W 
CaseMouseAudioOther
Cooler Master HAF 932 Advanced Full Tower Case Logitech Wireless Performance Mouse MX Creative Sound Blaster Recon3D THX PCIE Fatal1t... Atech Flash Pro-55U Internal Flash Memory Card ... 
  hide details  
Reply
post #4 of 4
Quote:
Now my question:
On the CPU-Z memory tab, it shows memory frequency is 400Mhz and that FSB:RAM ratio is 2:3. CAS Latency is 5 clocks.

Would someone who understands this please diagnose? Since it's DDR2 ram, does the frequency of 400Mhz mean the memory is actually running at the 800Mhz the memory is spec'd at? If so, or even if not, why is latency 5 clocks--I thought it would be 4. And please translate the 2:3 FSB/ram ratio.

I don't think I can change anything because of the intel board. If there is something I should be doing to improve this, though, please let me know. Thanks.
That is normal, what you have to do is set the timings manually in the BIOS for a 4-4-4-12. Also a 2:3 ratio will give you the full speed of the RAM which is 800mhz, now don't forget to pump up the Vdimm to 2.1v at least because there may be a chance that the default settings in the BIOS brought the Vdimm down to 1.8v or 1.9v and that's not the rated Vdimm for your RAM.

If you plan on overclocking, get the ratio to a 4:5 or 1:1. 2:3 may be too much for the RAM you have when overclocking.
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