Confuse with RAM system bus

halytobe · 05-15-2007, 08:41 AM

Hello,
I've got some problem with RAM and here it is.

I bought a 512mb DDR (Kingston KVR400X64C3A/512) to replace two 128mb DDR (KINGSTON KVR266X64C25/128).

In the P4V845 Series motherboard booklet - under the System Memory it stated that:

*A total of two 184 - pin DDR SDRAM sockets.
* Support up to 2GB DRAMs (512x8/x16 DRAM Technology) for register and unbuffered DDR SDRAM module.
*Suppor DDR SDRAM memory types.
*2.5v DRAM interface for DDR SDRAM.

What makes me confused is the information on the motherboard box:
PC133 OR DDR266 SDRAM*/ 400MHz OR 533MHz SYSTEM BUS

From my understanding, it's clear that the motherboard only support 2.5volt DDR. In short, If I want to buy 512MB of DDR , I have to choose only 266MHz and not 400MHz rite?

Question 2
I love to play Online 3D games (Risk Your Life) and I know AC 230AV POWER SUPPLY UNIT is not enough. Can you suggest a good PSU Watt?

PC SPECS

WINDOWS XP PRO SERVICE PACK 2
MOTHERBOARD P4M266A - 8235 MODEL / P4V845 SERIES V845DA2
INTEL PENTIUM 4 1.80GHz
MAXTOR 40GB HARDISK 5200RPM
NVIDIA GEFORCE 2 MX/MX400
KINGSTON KVR400X64C3A/512MB PC3200 184 - PIN DIMM
SAMTRON 56E/57E/56V
SiS 900 PCI FAST ETHERNET ADAPTER
AC 230AV POWER SUPPLY UNIT

dai · 05-15-2007, 12:07 PM

http://www.newegg.com/Product/Produc...82E16817371002
if you do a price search someone may have it on special

halytobe · 05-16-2007, 12:09 PM

If the motherboard only support 2.5 v that are 266MHz and 333MHz DDR, then It is compatible to use 400MHz and 533MHz with 3.0 volt?

I just want to make sure, which is the right DDR system bus for the motherboard.

dai · 05-16-2007, 01:23 PM

if the m/b only supports 2.5v then 3v ram is the wrong ram
http://www.kingstoncare.com/setlang....-en&frame=home
http://www.corsairmemory.com/corsair...or_search.html

**Kalim** · 05-17-2007, 04:37 AM

Quote:

What makes me confused is the information on the motherboard box:
PC133 OR DDR266 SDRAM*/ 400MHz OR 533MHz SYSTEM BUS

System bus is the FSB figure used by the processor and supported by the MB, i.e. 400MHz or 533MHz.
Memory bus is the DDR figure you're after, i.e. DDR266.

That's what your system supports. DDR266 SDRAM at 2.5V.

halytobe · 05-17-2007, 10:31 AM

Ok thanks a lot.
I should read the manual first before buying new RAM.
I'll post another problem later.

05-15-2007, 08:41 AM	#1 (permalink)
halytobe Registered User Join Date: May 2007 Posts: 14 OS: XP	Confuse with RAM system bus Hello, I've got some problem with RAM and here it is. I bought a 512mb DDR (Kingston KVR400X64C3A/512) to replace two 128mb DDR (KINGSTON KVR266X64C25/128). In the P4V845 Series motherboard booklet - under the System Memory it stated that: A total of two 184 - pin DDR SDRAM sockets. Support up to 2GB DRAMs (512x8/x16 DRAM Technology) for register and unbuffered DDR SDRAM module. Suppor DDR SDRAM memory types. 2.5v DRAM interface for DDR SDRAM. What makes me confused is the information on the motherboard box: PC133 OR DDR266 SDRAM*/ 400MHz OR 533MHz SYSTEM BUS From my understanding, it's clear that the motherboard only support 2.5volt DDR. In short, If I want to buy 512MB of DDR , I have to choose only 266MHz and not 400MHz rite? Question 2 I love to play Online 3D games (Risk Your Life) and I know AC 230AV POWER SUPPLY UNIT is not enough. Can you suggest a good PSU Watt? PC SPECS WINDOWS XP PRO SERVICE PACK 2 MOTHERBOARD P4M266A - 8235 MODEL / P4V845 SERIES V845DA2 INTEL PENTIUM 4 1.80GHz MAXTOR 40GB HARDISK 5200RPM NVIDIA GEFORCE 2 MX/MX400 KINGSTON KVR400X64C3A/512MB PC3200 184 - PIN DIMM SAMTRON 56E/57E/56V SiS 900 PCI FAST ETHERNET ADAPTER AC 230AV POWER SUPPLY UNIT

05-15-2007, 12:07 PM	#2 (permalink)
dai Manager, Hardware Forums Join Date: Jul 2004 Location: west australia Posts: 41,845 OS: vista 32x ultimate retail	Re: Confuse with RAM system bus http://www.newegg.com/Product/Produc...82E16817371002 if you do a price search someone may have it on special __________________

05-16-2007, 12:09 PM	#3 (permalink)
halytobe Registered User Join Date: May 2007 Posts: 14 OS: XP	Re: Confuse with RAM system bus If the motherboard only support 2.5 v that are 266MHz and 333MHz DDR, then It is compatible to use 400MHz and 533MHz with 3.0 volt? I just want to make sure, which is the right DDR system bus for the motherboard.

05-16-2007, 01:23 PM	#4 (permalink)
dai Manager, Hardware Forums Join Date: Jul 2004 Location: west australia Posts: 41,845 OS: vista 32x ultimate retail	Re: Confuse with RAM system bus if the m/b only supports 2.5v then 3v ram is the wrong ram http://www.kingstoncare.com/setlang....-en&frame=home http://www.corsairmemory.com/corsair...or_search.html __________________

05-17-2007, 10:31 AM	#6 (permalink)
halytobe Registered User Join Date: May 2007 Posts: 14 OS: XP	Re: Confuse with RAM system bus Ok thanks a lot. I should read the manual first before buying new RAM. I'll post another problem later.