High Density vs Low Density Compatability

These are the specs from the emachines website:

Intel® Pentium® 4 Processor 1.60GHz (w/256KB)
Operating System: Microsoft® Windows® XP Home Edition
Chipset: Intel 845 chipset
Memory: 256MB SDRAM (PC133)
Hard Drive: 40GB HDD
Optical Drive: Built-in 16x Max. CD-RW Drive; 3.5" 1.44MB FDD
Video: NVIDIA TNT2 M64 AGP with 32MB
Sound: AC '97 Audio
Network: 10/100Mbps built-in Ethernet
Modem: 56K ITU v.92-ready Fax/Modem
Peripherals: Keyboard, Wheel Mouse, Premium Speakers
Ports/Other: 4 USB ports (2 on front), 1 Serial, 1 Parallel, 2 PS/2, Audio In & Out, Midi/Game port, Mic-In & Head Phone jack on front

I got this in an email from their support people:

Chassis: Vernal+
Motherboard: TriGem International Dublin
CPU: Intel Pentium 4 1.6 GHz
Memory: 256MB SDRAM PC133 DIMM
Power Supply: Enhance Electronics ATX ENP-2120D 220 WATT
Video: nVidia TNT2
Audio: Intel ICH AC 97 CODEC
Hard Drive: Seagate ST34081A 40.8 GB 5400 2 MB
Primary Optical Drive: [CD-R/RW] 16x / 10x / 40x LG Electronics

GCE-8160B/TGW
Floppy Drive: 3.5 Generic
Modem: Conexant 56K ITU v.92 Fax/Modem
Network Interface: ADMtek AN983B
USB Ports (FRONT/SIDE): 1
USB Ports (REAR): 2
Firewire Ports (FRONT/SIDE): 0
Firewire Ports (REAR): 0
Mini-PCI Slots: 0
PCMCIA Slots: 0
Mouse: PS/2 eMachines Standard
Keyboard: PS/2 Standard 104
Speakers: Standard
Restore CD: T4160 / T4200 1.1


RAM Type: SDRAM PC133 DIMM
Number of RAM Slots: 3
Total RAM Capacity: 3072 MB
RAM Stick Size Limit: 1024 MB
Module: DIMM
Type: SDRAMBus Speed: 133 MHz
Number of Pins: 168 pins


This is my second PC, I want to toss some memory in there to help with some games, I already have a second 256 stick in there, was thinking of maybe adding a 512 in the third slot. I believe the other 2 are low density. The question I have is will high density be supported by my mobo? It's considerably cheaper, I went to a lot of sites, some said the high density isn't supported by intel chipsets, some said it will work. The tech people can't seem to give me a straight answer. I realize to ensure compatibility, go with the low density, but I wouldn't mind saving a few bucks if it could be supported, SDRAM is expensive as it is. Also, I seem to remember that you shouldn't mix high and low, is that the case? I guess if so, that sort of answers my question. Thanks