On 8/25/06, Timothy Miller <[EMAIL PROTECTED]> wrote:
On 8/25/06, Jon Smirl <[EMAIL PROTECTED]> wrote:
> On Thu, 24 Aug 2006 21:18:06 -0400, Timothy Miller wrote:
>
> > Here is a PDF of a datasheet on DDR SDRAMs that has detailed descriptions
> > and timing diagrams:
> >
> > http://download.micron.com/pdf/datasheets/dram/ddr/256MBDDRx4x8x16.pdf
>
> The better graphics cards all use GDDR RAM. Is it's interface
> significantly different than normal DDR?
As far as I know, there are some speed and signalling advantages to
GDDR, but the expense is not worth it. With a reasonably intelligent
memory system, we can get just about the same performance out of much
cheaper DDR memories.
In the days of SGRAMS (Graphics SDRAMS, single data rate), there were
added features, including write-per-bit (planemasks loaded into the
RAM chip, not useful for 3D graphics), and block fill (solid fill at
8x rate, also not exceptionally useful to us). I'm not sure if GDDRs
retain these features.
With my recent encounter with the vga bios im pretty much happy with
ordinary ddrs. As long as i can stick the card in my pc and program it
to boot up really quickly without he need for an opaque bios.
--
things i hate about my linux pc:
1. it takes more than a second to boot up
2. keeps asking about filenames and directories
3. does not remember what i was working on yesterday
4. does not remember all the changes i have ever made
5.cannot figure out necessary settings by itself
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