Datorn blev långsammare när jag satte i mer minne varför?

Spec: P 3,0 800mhz N. Minne Apacer DDR PC3200 400MHz 512 Mb köpte sedan - Corsair Value Select 2x512Mb (tot. 1024Mb/1Gb) Dual DDR PC3200 400MHz 184pin CL2.5. Jag har provat i alla slots men när jag testar i everest så är datorn långsammare med dom nya minnena.

Spec: Moderkort
CPU Socket 478, Intel Pentium 4 (Northwood / Prescott) / Celeron
FSB 800MHz/533MHz

Chipset VIA PT800+ 8237, Supports Hyper-Threading Technology
Hybrid Booster CPU Frequency Stepless control
ASRock U-COP,
Boot Failure Guard (B.F.G)
Memory Max. 3GB
3 x DDR DIMM slots,
DDR 400/333/266
Slots AGP 8X/4X V1.5
5 x PCI slots
VGA N/A
Audio Chip AC97 CODEC
Channel 5.1 CH
LAN 802.3u, 10/100 Ethernet LAN, WOL supported
Modem (optional) N/A
Connector Serial ATA - 2xSATA connectors, 1.5Gb/s,
RAID 0,1,JBOD
SATA HDD HotPlug
IDE 2 x ATA 133/100/66/33
Floppy 1 connector
SIR/CIR 1/0
ASROCK I/O Plus Keyboard PS2 x1
Mouse PS2 x1
USB2.0 - 6 ports default on rear panel + 2 ports upgrade via header
Serial 1
Parallel 1
LAN 1 x RJ45
Audio I/O Line In/Line Out/Mic.
ASRock U-COP ASRock Universal CPU Overheating Protection
Other Connector CPU/Chassis FAN connectors
20 pin ATX power connector
CD/AUX/ audio in
Front panel audio connector
2x USB2.0 header
BIOS Feature 2Mb AMI BIOS with ACPI, SM BIOS 2.3.1, PnP
Manageability WOL,WOR
Support CD Drivers,
Bundle CD includes:
Anti Virus Software,
ASRock PC DIY Live Demo,
Audio Player, RAID controller, etc..