That's what I get for not researching the guts of the card. I saw the 4x increase in memory and figured it would blow away my 8600 GT which is very dated. I was wrong.
Let me give you some advice on graphics memory that has been true since time began, is true today and will remain true forever in the future so you can file this away in your memory.
All else being equal*, as long as there is enough** graphics memory, the amount of graphics memory has absolutely nothing to do with performance. Nada. Zip.
*Equal meaning comparing same core, clocks and bit width.
**What is "enough" will change depending on what game you are running, so "enough" is a moving target. For modern (AKA those published in the last year) I would think that most people/benchmarks will roughly agree that 512MB is no longer sufficient and 1GB is sufficient. If you have insufficient graphics memory excess textures will be stored in your system memory, thus impacting performance. However, extra graphics memory will stay unused and thus have no impact on performance. What can impact performance with graphics memory of sufficient capacity is overall bandwidth. This is calculated using the clock speed, a data rate multiplier (2x for most, except 4x for GDDR5) and the bit width of the memory bus (AKA 128-bit, 256-bit, etc.).
I went to newegg looking again and all I find in the 8000 series is 8400 cards. I don't know why there isn't any 8600 GT or 8800 GT cards to be found. The funny thing is; I went with an 8600 GT because when I built this rig a few years ago, 8800 GT cards were in the $300-$500 range. Now that I am ready to move up to the 8800GT, it's nowhere to be found.
Were you not aware that products change over time? You can no longer buy new Ford Probe or Toyota Supra cars in the USA, nor can you buy new computers with Windows 3.1 or socket 370 Celerons. Sadly nobody sells those sweet Voodoo 3 video cards anymore, and hardcore Counterstrike 1.6 players everywhere are mourning the lack of quality new CRT monitors.
Sorry, I was teasing you. ()
Here's another bit of info for your long-term memory:
"Nvidia also adopted the goal of an internal six-month product cycle." It isn't a hard truth, but more like a guideline. Both AMD and Nvidia come out with new products very rapidly, usually anywhere from 6-12 months. Older products get discontinued once they have a direct replacement, and eventually the remaining stock sells out.
There are a couple of special cases where products remain for a long time. One of them is the GeForce 6200 and another is the GeForce 8400 GS. The reason for these two products to have a super long product life is because the 6200 is the most recent and cheapest GPU that still natively supports older interfaces such as PCI without the added expense of a bridge chip. The 8400 is the cheapest PCIe GPU that uses the current shader system which can support CUDA/OpenCL. These are great for, basically, replacement parts for older computers that just need a simple video output.