I'm not sure if the ram I'm trying to install is compatible with my pc

I tried installing two 4gb sticks of ram in my Dell Optiplex 780 SFF, but my computer won't booth up and it starts beeping with either of the two sticks installed.(I installed the two sticks of ram separately,one after the other, not as a pair). Someone told me that updating the bios might help out, but it hasn't. I'm starting to think that the ram is not compatible with the motherboard. If anyone can please help me with some feedback I'd be grateful and appreciate it very much.
(Specs of the ram I tried to install)

Crucial DDR3-1333 4GB/512Mx64 CL9 Non-ECC unbuffered
Part Number: CT51264BA1339J

Kingston DDR3-1333 4GB/512MX72 ECC Registered 1.5V, CL9
Part Number:  KTD-PE313S/4G




(My PC Specs)
Dell Optiplex 780 SFF

Motherboard Chipset :Intel Eaglelake Q45
CPU Type: DualCore Intel Core 2 Duo E8400, 3000 MHz (9 x 333)
Original Clock    3000 MHz

L1 Code Cache: 32KB per core
L1 Data Cache: 32 KB per core
L2 Cache: 6 MB  (On-Die, ECC, ASC, Full-Speed)

Memory Bus Type: Dual DDR3 SDRAM
Bus Width: 128-bit
DRAM:FSB Ratio    16:10
Real Clock: 533 MHz (DDR)
Effective Clock:1067 MHz
Bandwidth: 17067 MB/s