Need Help with Memory! ASAP!

[lalawyer]

I have a Dell XPS 720 system with 2 gigs of Corsair Dominator PC-2 8500 memory. One of the sticks went bad, and now Dell is going to send me another one. Two Questions:

 

1. I want to upgrade to 4 gigs. Can I can just buy the Twin2x2048-8500C5D and drop them into the existing system (with the new stick, of course) without any performance change?

 

2. When Dell sold me the computer they told me that the Dominator sticks were o'c to 1066 mhz. The sticks say 800M on them. In my bios, it says 800M on the memory speed. How do I see if they sticks are running at 800 or 1066?

 

Thanks for the help.

 

Scott

[RAM GUY]

1. I want to upgrade to 4 gigs. Can I can just buy the Twin2x2048-8500C5D and drop them into the existing system (with the new stick, of course) without any performance change?

A: I would not suggest it just replace what you have now with one Twin2x4096-8500C5D set of modules for best performance.

 

2. When Dell sold me the computer they told me that the Dominator sticks were o'c to 1066 mhz. The sticks say 800M on them. In my bios, it says 800M on the memory speed. How do I see if they sticks are running at 800 or 1066?

A: They will run at DDR800 by default so the system can post,, but the EPP Profile will have to be enabled and if it is they will run at DDR1066. You can run CPU-Z and look in the Memory Tab to see if they are running properly.

[lalawyer]

Ok...some additional information from CPU-Z.

 

The single ram stick that is currently running is as follows:

 

General

Memory type DDR2

Module format Regular UDIMM

Manufacturer (ID) Corsair (7F7F9E0000000000)

Size 1024 MBytes

Max bandwidth PC2-6400 (400 MHz)

Part number CM2X1024-8500C5D

Serial number FFFFFFFF

Manufacturing date Week 165/Year 165

 

Attributes

Number of banks 2

Data width 64 bits

Correction None

Nominal Voltage 1.80 Volts

EPP yes (1 profiles)

XMP no

 

Timings table

Frequency (MHz) 270 400

CAS# 4.0 5.0

RAS# to CAS# delay 4 5

RAS# Precharge 4 5

TRAS 13 18

TRC 15 22

 

EPP profile 1 (full)

Voltage level 2.200 Volts

Address Command Rate 2T

Cycle time 1.875 ns (533.3 MHz)

tCL 5.0 clocks

tRCD 5 clocks (9.25 ns)

tRP 5 clocks (9.25 ns)

tRAS 15 clocks (28.00 ns)

tRC 22 clocks (41.00 ns)

tWR 8 clocks (15.00 ns)

 

 

Is this not PC2-8500 memory?

Is it running at 1066 mhz?

I see that EPP is not turned on in the bios...do I need to turn that on?

Do you still recommend replacement with the Twin2x4096-8500C5D?

If so, do I just drop in the sticks or are there other settings I must make to get full performance?

 

 

Thanks again,

Scott

[RAM GUY]

Is this not PC2-8500 memory?

A: Yes:

EPP profile 1 (full)

Voltage level 2.200 Volts

Address Command Rate 2T

Cycle time 1.875 ns (533.3 MHz)

tCL 5.0 clocks

tRCD 5 clocks (9.25 ns)

tRP 5 clocks (9.25 ns)

tRAS 15 clocks (28.00 ns)

tRC 22 clocks (41.00 ns)

tWR 8 clocks (15.00 ns)

Is it running at 1066 mhz?

A: Look under the Memory Tab like I told you previously and what does it say?

I see that EPP is not turned on in the bios...do I need to turn that on?

A: Yes I would suggest talk to the system builder if that is the case so they can help you.

Do you still recommend replacement with the Twin2x4096-8500C5D?

If so, do I just drop in the sticks or are there other settings I must make to get full performance?

A: If you ant 4 Gig then yes you will want to replace what you have and then you would load setup defaults and set SLI Ready memory to enabled or CPU MAX.