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Re: PCI card current loads
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: PCI card current loads
- From: John R Pierce <pierce@scruznet.com>
- Date: Mon, 28 Oct 1996 14:11:45 -0800
- Resent-Date: Mon, 28 Oct 1996 14:11:45 -0800
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-Id: <"0PtEx.0.NU4.G0JTo"@dart>
- Resent-Sender: pci-sig-request@znyx.com
At 09:53 AM 10/28/96 +0000, Thomas_Schutt@splashtech.com wrote:
> For example, has anyone
>measure the step responce in current draw when dynamicly switching a
>multi sync 21" monitor and graphics card from VGA mode to 1600x1200
>pixel x24 bit resolution ( <60 MBytes/sec to >400 Mbytes/sec )?
Err, VGA mode 12 (640x480x16 colors) is only 9MByte/sec... OTOH, any card
doing 1600x1200x24bpp is using VRAM which is not being cycled at 400MB/s,
only the serial outputs are clocking that fast (or /8 that fast, 50M qwords/sec)
Actually, most graphics accelerators hit peak memory bandwidth while doing
hardware blitter operations, such as scrolling or rectangle fill...
-jrp
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