How many pictures can I expect to get off 1GB?

according to this
http://www.findlaptopdriver.com/dell-0wc297
you may upgrade to 2GB (2 x 1GB)
This is what I expect for this generation of m/b and CPU

ya definitely upgrade to 2GB it will increase overall system performance then you can feel easy to work in 7

That depends on several factors. Among them are the picture resolution (a 12MP picture will generally take more space than a 6MP picture), the quality (BASIC will produce smaller files than FINE). In addition, some cameras allow you take pictures in RAW format instead of (or in addition to) JPEG format. RAW files are much larger than JPEG files since they include all the data that comes from the sensor, not just the processed results. In addition, the subject itself will affect the size (a blank white wall requires less memory than a finely detailed landscape, for example).

Your manual should have a page giving you general guidelines as to how many pictures you could expect to store on a card. That page may give you numbers for a different sized card, but you can simply scale the results. For example, if the page says it's for a 1GB card, simply double all the numbers.

It's also good practice to have a spare card. That way, if you suddenly get creative (or if something happens to your first card) you can keep shooting.

Check the setting where the pictures are being stored. It may be still storing to the internal memory.

Also check what resolution you are capturing your snaps. Although 22 pictures should not fill your memory but high resolution photos can take 5-6 MB /photo, so you can accomodate about 180-200 photos in 1GB. Try reducing the photo resolution, if you are not planning to print them.

Also, have you downloaded all the previous snaps from the card and deleted it from the 1GB card?

You would only get a marginal performance increase. If your laptop has 256Mb of RAM, increasing the RAM up to 1Gb (this model laptop cannot support more than 1Gb RAM) would boost the performance of the laptop.

a 1 GB card is SMALL - and is likely very very slow in saving pictures. you may want to tryt to get a different, larger memory card

its non supportive to 1gb card as you will have to get the device upgraded to make it support 1gb.

http://members.aceweb.com/gregg1/acer/Inside_Acer_Aspire_5315.html

go here for a picture of the inside of acer 5315 and how to remove the cover to access the ram

I hope this helps

Follow the instructions on this page of the user guide.

Samsung only guarantees that a 1GB external memory card will work. If you look at the user manual on page 77. I just used a 1GB memory card instead and it worked fine.
I am not saying that no memory cards greater than 1GB will work, but if it doesn't work or stops working then it is because the software for the phone is not set up to handle it. I had the same issue and had to switch to a 1GB card.