Computing.Net - ATI X1600 PRO 512MB AGP Mem Clock?

Subject: ATI X1600 PRO 512MB AGP Mem Clock?

Original Message

Name: NeOn10th
Date: January 3, 2007 at 18:51:41 Pacific
Subject: ATI X1600 PRO 512MB AGP Mem Clock?
OS: XP Pro
CPU/Ram: P4 3.0/512MB
Model/Manufacturer: Intel

Comment:

I have noticed many of the exact ATI x1600 pro cards having different clocks for AGP made by ATI. Core clocks are the same for the most part, but memory clock is what is confusing me. Some 256MB versions have 780 mhz memory,but my 512 MB is merely 396 mhz! Is it my higher RAM that makes this happen, so there is not much of a difference in gameplay performance, or is the 256 going to be a lot faster?

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Response Number 1

Name: TMP-Man
Date: January 3, 2007 at 20:04:26 Pacific
Subject: ATI X1600 PRO 512MB AGP Mem Clock?

Reply: (edit)

Given its GDDR where DDR = double data rate, so having 396Mhz is ~782Mhz (396x2) effective under DDR...
TMP-Man
Asus P5P800-SE PAT
P4 506 @ 4009Mhz 1.3625v
Thermaltake CLP0024 w/ 1700RPM 92MM + AS5
2GB OCZ 2-3-2-5 DDR400
120GB/300GB 7200RPM HD
Leadtek 7600 AGP 590/1600 VF700 ALCU AS5

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Response Number 2

Name: jam
Date: January 3, 2007 at 20:05:13 Pacific
Subject: ATI X1600 PRO 512MB AGP Mem Clock?

Reply: (edit)

Some manufacturer's list the actual memory clock speed (396MHz) & others list the effective DDR clock speed (780MHz).
In other words....
396MHz (actual) = 792MHz (effective)
780MHz (effective) = 390MHz (actual)

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Response Number 3

Name: Sabertooth
Date: January 3, 2007 at 22:24:46 Pacific
Subject: ATI X1600 PRO 512MB AGP Mem Clock?

Reply: (edit)

I suspect both ATI & NVIDIA are somewhat trying to adapt the DDR clock representation as the standard, because I also noticed the most recent driver upgrade for my 6800 automatically switched the memory clock - it now reports 1750MHz (DDR) as opposed to 875MHz that it used to show.

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Response Number 4

Name: NeOn10th
Date: January 5, 2007 at 12:20:06 Pacific
Subject: ATI X1600 PRO 512MB AGP Mem Clock?

Reply: (edit)

Ohm ok thanks. Sabertooth, is your 6800 PCI-Express or AGP? That would be a pretty fast clock for memory if it was AGP.

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Response Number 5

Name: Sabertooth
Date: January 5, 2007 at 13:49:42 Pacific
Subject: ATI X1600 PRO 512MB AGP Mem Clock?

Reply: (edit)

It is an AGP card.

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