Very low Mem. Bandwidth

I have the Asus P5B Deluxe w/ Intel P915 chipset @ 1.55V and the latest bios. I also have 2x twin Corsair 512MB DDR2800 OC'ed @ DDR21000 @ 2.10v. My processor is the Pentium D 915 @ 3.5GHZ @ 1.5V. The RAM timings are 5-6-5-18. The TRFC is at 35 and write recovery time is at 6. I have tweaked with all these settings under the RAM SPD timings as much as I can and still nothing. When i go to memtest it tells me 4023 mb/sec. for bandwidth. Sandra tells me the same. That is way too low for DDR2-1000 or even DDR2-800. I have attempted to lower the write to read delay, read to precharge delay and write to precharge delay but there all at 10, except for write to precharge delay. Any help in getting these things where they should be would be appreciated.

Note- the Modules are in dual channel mode.



Modules- CORSAIR XMS2 1GB (2 x 512MB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model TWIN2X1024A-6400 - Retail

 

What do you get when your pc isnt overclocked? Is it definitely running in dual channel?

 

not oc'ed im getting about 3200 mb/sec. and yup bios confirms its running in dual channel

 

Have a look in the task manager and see how much ram you have free and if there are any programs doing loads of work.

 

yeah my ram is almost always loaded in windows with all my background programs but what does that have to do with anything? no offense. Memtest is run outside of windows and that tells me the bandwidth so i cant see why the load would have any effect on the bandwidth its giving.

 

Oh yeah, didnt notice you got it from memtest.

 

yeahhh, sorry should of said that on the end. For now i dont know. Maybe the RAM is damaged or im just missing something in the BIOS. idk...