Do not go. 5

Have the memory a Fujitsu Siemens Scenic Te want to upgrade to Pentium 4. The initial joy over the speed increase but was quickly marred after programs crashed constantly. Have memory chips (had 4 for 2 computer purchases) then individually checked with memtest86 + and lo and behold, the error counter would not stop rattling. When he arrived at the 8-digit area, I ended the test. All 4 blocks showed the same error on both computers. I wondered if I could possibly have bought the wrong building blocks and looked in the manual of the motherboard (D1534). But here is clear:

Technology: DDR 266, DDR 333 or DDR 400 unbuffered DIMM modules
184-pin; 2.5V; 64 Bit, no ECC
Total size: 64, 128 Mbytes to 2 Gbytes DDR SDRAM
Module sizes: 64, 128, 256, 512 or 1024 Mbyte for one socket

Allow more processing exemplary, print return documents, glued and returned on package. Trouble refund (hence 2 stars).