HP 620 RAM speed at 800MHz?

[mandatory]

My company have 10 laptops HP 620. Recently, we decided to upgrade their hard drive and RAM, as they had a 320GB HDD and 2GB RAM. We found out that, before doing any upgrade, RAM speed was 800MHz. We find it out via cpu-z which mentions DRAM frequency 399MHz. With DDR is becomes 798MHz. We also ran DOS command, I think it was: “wmic memorychip get speed” which gave us the same result. The initial module that all laptops have, is a Micron mt8jsf2566hhz-1g4d1 DDR3 module that can run up to 1333MHz. We updated BIOS to the latest version but nothing changed to all devices. We replaced that module with a Corsair CMSO4GX3M1A1333C9 and the same speed is reported. On the other hand, HP states that those laptops support 1066 and 1333MHz DDR3 modules. No reference to 800MHz. CPU is Core 2 Duo T6670 at 2,2GHz. According to cpu-z, FSB:DRAM is 1:2.The BIOS is a freaking business BIOS and it is extremely minimal, so I have no option to set RAM speed or something to adjust speed to 1333. So, what is going on here? How will I solve this?

[banhien]

@mandatory 

At the beginning they ran single channel with 1333MHz. Now probably you use 2 pieces of 1600MHz therefore they run as Dual channels that why 800MHz (or 798MHz) comes from because 800MHz x 2 = 1600MHz

Hope this makes sense.

Regards.

[mandatory]

@banhien

 ***bleep***

This laptop supports up to 1333MHz modules. The modules are DDR3 1333MHz sticks and the are running at 1600 with no overclocking?

FSB:DRAM ratio is 1:2. That means we have CPU with 800MHz FSB (the apps state so and Intel here too) that means Bus of 200MHz because it is QDR, Quad Data Rate. So RAM has double of it, a clock of 399MHz. We are talking for DDR modules, Double Data Rate onces, so it is like running at double speed, as 798MHz totally, not 1600MHz. The issue appears with every combination, before and after BIOS update:

• only the Micron module that our laptops had from the factory, no mater what (out of those two) slot we use
• only the Corsair module that we bought, no mater what (out of those two) slot we use
• both the abouve modules, no matter the combination in the slots (Micron in the first or the second one and Corsair in the other)

I hope I was crystal clear this time my friend.