Bought 2 gigs of RAM but Pavillion NY801AV-ABA p6100z doesn't recogize it.

Top view of motherboard, scroll down. (Thought you might also like to read the reviews, and Comments)

http://www.bit-tech.net/hardware/motherboards/2007/12/06/abit_ix38_quadgt/2

Motherboard User Manual,

http://www.theraptorpit.com/forum/index.php?/forum/124-abit-motherboard-tech-support-unofficial/

1) On the motherboard the Blue ram memory slot that is closest to the copper heatsink, is ram memory Slot 1.
Also known as DIMM 1.

Ram memory ALWAYS has to be in this ram memory slot.
The Processor reads ram memory Slot 1 first.

2) The Blue ram memory slots are Slot 1 (DIMM 1), and Slot 3.
(DIMM 3)
The Black ram memory slots are Slot 2 (DIMM 2), and Slot 4.
(DIMM 4)

To run Dual Channel ram memory, means there are two LIKE ram memory modules ('Stick'), and they are installed in the SAME channel.

This would mean to alike ram memory modules, in both Blue ram memory slots, or both Black ram memory slots.

Since the ram memory modules need to be alike, they are generally purchased from the same manufacturer, and are the same kind.

Running ram memory in a dual channel configuration, is supposed to increase ram memory 'speed', up to 30 percent.

This is Baloney!
May look good on paper, but in actual use in the field it's cr@p.
Actual performance increase is more like 1 to 2 percent.
This has been proven by Tom's Hardware, and many, many motherboards, ram memory, Processors, etc.

So you have 2GB of DDR2 Sdram, huh?
Is it just one 'stick' of ram memory, or are you referring to two 1GB sticks?

If the above holds true install them in Slot 1 and Slot 3.

If not, and it is a 2GB stick of ram memory, be sure it is installed in Slot 1 (DIMM 1)
Install the 1GB stick in Slot 2.

It isn't the same as the 2GB stick.
It is 1GB.
Does NOT go in a dual channel configuration.

(Catching all this? There is NO dual channel ram memory!

It is ram memory that is -> ALIKE, and used in a -> dual channel configuration.
Used in two separate ram memory slots, that support the dual channel configuration.

Sold with the advertising scheme of 'Dual Channel', but really just means the two ram memory modules, (Or four), are -> alike.

1) Same Voltage used
2) Same Ram Timings
3) Same Chip Configuration
4) Same size in amount
5) Same frequency rate ('Speed')

With ram memory in a dual channel configuration, the ram memory modules team up on the task.)

For additional questions please post in a Comment.

Regards,
joecoolvette

I have a Compaq that came with this board and a celeron 1.8 or 2.0 I believe. The fastest P4 that will run is a Intel Northwood 2.8 Ghtz 400 FSB nothing ELSE! Northwood 2.8 is the fastest 400 FSB, the boards chipset won't run anything faster than 400 FSB. Mine is running, Win 7 the Northwood P4 2.8 with 2 gigs ram, 160 gig HD and a 256 video card for over 5 years (minus win 7, had XP before with no issues. Good for light gaming, web surfing and MS office! Add a Zotac 512 MB PCI or Sparkle Video card and you can handle most more medium gaiming out today! My cards have HDMI and DVI output. I highly recommend it!

try to change slots of the Ram. Still if it's not working try only with new RAM to check if new RAM is working fine or not.

usually the processors which we normally use are 32 bit. So we cannot extend the RAM beyond 4gb. That is the maximum limit.

Well I have found all the drivers, here for you.
http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=228&lc=en&dlc=en&cc=us&lang=en&product=404643

Mine will not see 2 gig either... i tried putting the 1 gig and the original 512mb in, and it does see all 1.5 gig... not a perfect solution, but better than only one gig.

did you only install one 1 gig stick if so thats the problem ram has to be in matching pairs so for 1 gig you need two 512 sticks

If you do not get the right memory for your computer it will not work. the memory you need is listed in the table below. And pay attention to the max amount of ram. Your system can only hold 2 gig and it comes with one gig installed

Component Attributes Memory Installed 1 GB Maximum allowed 2 GB (2 x 1 GB) Speed supported PC2-4200 MB/sec Type 240 pin, DDR2 SDRAM

nope....that 2 gig is true..and the reason it may be invisible is that it is not seated properly, or, it is mismatched..

Switch sticks around in various combinations (2 gig in slot one, 1 gig in slot two, switch, try other stick, etc) and see if it is the memory or the motherboard.