Performance boost with ram upgrade?

I have a T7700, and noticed on newegg as I was looking at their socket P processors that it has 800mhz fsb. My ram is only 667mhz, and I'm not good with how the ram or cpu fsb multipliers work, so I wanna know if I'd get a speed boost if I went with 800mhz ram, and if it would be worth it (2gb).

 

No speed boost. The CPU won't be able to use the full 800mhz bandwidth.

 

Unless you overclock it
By the way, does anybody knows, what timings do that ddr800 modules have on ddr667? CL5-5-5-.. like 667 one or less?
If so, can anybody send ddr800 SPD dump, I'll want to try flashing it to my memory.

 

The laptop Intel 965 chipset only supports 667MHz memory. See http://www.intel.com/products/chipsets/PM965/index.htm

While you might be able to install 800MHz memory, it will only run at 667MHz...and you cannot overclock it.

 

What about the timings?
I meant fsb overclock, but unfortunately we can't do that now ether.

 

most 667 sticks are cl5 but g-skill makes cl4 also

 

1. You can't change the CAS Latency timing on memory.
2. The difference between CL 15 and CL 14 is not enough to have any real affect on performance.

 

Yes I can:
1) Set timings with MemSet, witch will be available for 965pm chipsets in the next version.
2) Write modified SPD to memory modules with SPDTool. It's just tricky to select the write timings without testing the. So MemSet would be really nice here. Or at least SPD dump from fast memory modules.

There is not only one CL to it and it is CL 5 and CL 4.

 

I don't know if I would trust a modified CAS timing to be stable, but that would seem to work just as well on the 667 MHz memory, which is natively supported by Santa Rosa, as on the 800 MHz memory, which you MIGHT be able to fully support with a FSB overclock.

 

The memory in all notebooks are different, it depends on the salesman.

 

Hi, I had a chance to use SODIMM DDR800 2GB today. Here is its SPD:

(On the left DDR800, on the write PQI DDR667)

Unfortunately when working in DDR667 mode it timings don’t differ from the usual DDR667 one:


So there is no real point in upgrading from 667, and if overclock I'm pretty sure that usual DDR667 memory will do that just as good as DDR800 will.

I added SPD dump file to the massage just in case anybody is interested.

 

I have 2x1024MB DDR2800 installed, and i can telll you my system is just as fast when using 2x1024 DDR2667.
The vendor supplied me with the latest mem speed at the time of bying the notebook.

 

Ah thanks guys for informing me, I was gonna buy it. How much RAM does XP recognize? 3GB or 3.5GB? In Crysis, I get the Low Memory error, and it crashes even with my 2GB so I'm looking to get a single 2GB 667MHz RAM, totaling 3GB.

 

But ddr800 is better for tweaking the memory timings... Shouldn't it?

 

Maybe, but if you ask me it's just plain old DDR667 remarked to DDR800.

 

@vashts:

32 bit Windows recognizes between 2.8-3.2 GB of memory, depending on your hardware configuration.