DRAM:FSB ratio question

[Lightwave]

Hi, i just bought a new PC with the following components:

Motherboard - Asus P7P55D
CPU - Intel Core i5 750 2.66
RAM - A-DATA DDR3 1600X 2x2GB Memory Kit

My question is about the memory, Everest shows a dram:fsb ratio of 5:1 and that the memory is running at 667 MHz. Is this ratio supposed to be normal? I though a ratio of close to 1:1 is usually desired. Also the Front Side Bus clock speed is 133 MHz. Here's the report from Everest:

      Motherboard Name                                  Asus P7P55D

    Front Side Bus Properties:
      Bus Type                                          Intel QPI
      Real Clock                                        132 MHz
      Effective Clock                                   132 MHz
      QPI Clock                                         2393 MHz

    Memory Bus Properties:
      Bus Type                                          Dual DDR3 SDRAM
      Bus Width                                         128-bit
      DRAM:FSB Ratio                                    5:1
      Real Clock                                        660 MHz (DDR)
      Effective Clock                                   1319 MHz
      Bandwidth                                         21107 MB/s

    Motherboard Physical Info:
      CPU Sockets/Slots                                 1 LGA1156
      Expansion Slots                                   3 PCI, 2 PCI-E x1, 2 PCI-E x16
      RAM Slots                                         4 DDR3 DIMM
      Integrated Devices                                Audio, Gigabit LAN, IEEE-1394
      Form Factor                                       ATX
      Motherboard Size                                  240 mm x 300 mm
      Motherboard Chipset                               P55
      Extra Features                                    JumperFree, Q-Fan, Stepless Freq Selection, Ultra-ATA/133, SATA-II

 

[CMH]

The 1:1 ratio was desired in the times of the Conroe.

However, I am equally interested in this question for the Nehalem family.

I don't think it is possible to get 1:1 with this chip.

 

[raybay]

Is it working right for you?
Does the ratio seem to make any difference?
The stats you show are decent, or better.
You took yourself out of the extreme high performance area when you chose A-Data, but if your games and graphics software still play nice, that is all you need. Right?

 

[Lightwave]

Also I expected the memory to run at 800 MHz, not 667, since it's supposed to be DDR 3 @ 1600 MHz (PC3-12800) as per the official web site:
oc.adata.com.tw/1_product_detail.asp?pid=AD31600XU2K (sry, can't post links yet)

cpuz lists it as PC3-10700 (667 MHz), weird..

DIMM #				1
	SMBus address		0x50
	Memory type		DDR3
	Module format		UDIMM
	Manufacturer (ID)	A-Data Technology (7F7F7F7FCB000000)
	Size			2048 MBytes
	Max bandwidth		PC3-10700 (667 MHz)
	Part number		DDR3 1600X        
	Number of banks		8
	Nominal Voltage		1.50 Volts
	EPP			no
	XMP			yes
	XMP revision		1.2
JEDEC timings table		CL-tRCD-tRP-tRAS-tRC @ frequency
	JEDEC #1		6.0-6-6-17-23 @ 457 MHz
	JEDEC #2		7.0-7-7-20-27 @ 533 MHz
	JEDEC #3		8.0-8-8-22-30 @ 609 MHz
	JEDEC #4		9.0-9-9-25-34 @ 685 MHz
XMP profile			XMP-1334
	Specification		PC3-10700H
	Voltage level		1.400 Volts
	Min Cycle time		1.500 ns (667 MHz)
	Min tRP			13.50 ns
	Min tRCD		13.50 ns
	Min tWR			15.00 ns
	Min tRAS		36.00 ns
	Min tRC			49.50 ns
	Min tRFC		110.00 ns
	Min tRTP		7.50 ns
	Min tRRD		6.00 ns
XMP timings table		CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
	XMP #1			5.0-5-5-14-19-0T @ 370 MHz (1.400 Volts)
	XMP #2			6.0-6-6-16-22-0T @ 444 MHz (1.400 Volts)
	XMP #3			7.0-7-7-19-26-0T @ 518 MHz (1.400 Volts)
	XMP #4			8.0-8-8-22-30-0T @ 592 MHz (1.400 Volts)
	XMP #5			9.0-9-9-24-33-0T @ 666 MHz (1.400 Volts)
XMP profile			XMP-1600
	Specification		PC3-12800
	Voltage level		1.650 Volts
	Min Cycle time		1.250 ns (800 MHz)
	Min tRP			8.75 ns
	Min tRCD		8.75 ns
	Min tWR			15.00 ns
	Min tRAS		25.00 ns
	Min tRC			43.75 ns
	Min tRFC		110.00 ns
	Min tRTP		7.50 ns
	Min tRRD		5.50 ns
XMP timings table		CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
	XMP #1			5.0-5-5-15-25-0T @ 571 MHz (1.650 Volts)
	XMP #2			6.0-6-6-18-30-0T @ 685 MHz (1.650 Volts)
	XMP #3			7.0-7-7-20-35-0T @ 800 MHz (1.650 Volts)
	XMP #4			8.0-8-8-23-40-0T @ 914 MHz (1.650 Volts)
	XMP #5			9.0-9-9-26-45-0T @ 1028 MHz (1.650 Volts)
	XMP #6			10.0-10-10-29-50-0T @ 1142 MHz (1.650 Volts)

 

[red1776]

your MB may nativley support 1066 memory and defaulted to that speed, it will run at 1600 as OC'ed. change it in the BIOS.

 

[raybay]

Not uncommon, in my experience, with A-Data... I have had no failures, but have too often noticed performance issues...
But then it could be the system board... or elsewhere... Have you tried any of the other test software? Such as Sandr Lite 2010 SP2, SiSoft Sandra, Speccy, 3DMark Vantage or 3DMark03, 05, 0r 06
Everestm GPU-Z, SpeedFan, to see how everything fits together ?

 

[Lightwave]

your MB may nativley support 1066 memory and defaulted to that speed, it will run at 1600 as OC'ed. change it in the BIOS.

So I figured it out. You're right. Actually it defaults to 1333 and will run at 1600 only if OCed, I'd have to increase the FSB clock from 133 to 160 MHz and overclock the CPU from 2.66 to 3.2 GHz. I'm not really going to do it for now since I'm happy with the performance, anyway.

Thanks all.

 

[Lightwave]

double post, please delete this