I have a problem for detect my ram for SE7520BD2s

Hello try to download a manual here:

http://www.gigabyte.com/products/product-page.aspx?pid=3817#manual

Try only to use the white or the blue sockets, when inseting the modules. This depends how the mainboard is build, parallel or serial ram bank.
But one of the modules could have a defect .

4 x 1.5V DDR3 DIMM sockets supporting up to 16 GB of system memory.

Good luck

To determine if a 1Gb RAM module is faulty insert one RAM module in the motherboard at a time. If the both 1Gb RAM modules work then the RAM modules from different manufacturers are incompatible with each other. Try using RAM modules of the same make and speed.

www.intel.com/support/motherboard/desktop/d102ggc2/sb/cs-026579.htm#dimms

Sounds like the second RAM stick was placed in the wrong slot. I would suggest checking your motherboard manual to determine this. Some motherboard designs have unusual slot arrangements.

open your case and check your ram must be not inserted in the slot properly and if it is inserted properly then your motherboard does not support 4gigs of ram

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Hi,

Your motherboard supports Win XP 64 bit but what you have to see is whether it supports 8 GB RAM.

Regards

You have inserted RAM in the worng slots. Insert it in alternate slots and not in adjacent slots.

Your mobo is quite old and its chipset can only support a maximum of 512MB PER SIDE (technically called a bank) of a memory module. I would guess that your 1gb memory module has 8 chips that are all located on one side of the module, putting all of the 1 GB on one bank. Thus, only 512MB of your 1 gb RAM is detected and usable by your motherboard (the remaining 32 mb is most likely being used by your onboard video). You'll need to find a double sided 1 gb memory module (usually 8 chips on each side).

Ok, I got it, Ur motherboard supports upto 8GB DDRII Dual channel

Try using these RAMs on other slots of the board to check if there is a problem with RAM Slot (As there are four slots on ur board).

If no success, try using RAMs on some other system to confirm whether problem is with RAM or Motherboard.

may be frequency is different of RAM,just check it