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Memory Clock Speed

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tisello   07-31-2009 at 09:52:44 PM

I was looking at some Radeon 4890 1gb's when i saw something

PowerColors and XFXs card had something called 4.0GHZ Memory Clock Speed while Sapphire only had 1.05GHZ Memory Clock Speed?

What difference does this make and wich card is superior?

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mactronix   07-31-2009 at 10:07:37 PM
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Its probably just the GDDR 5 causing the issue. Some makers quote the actual clock speed and some quote the effective clock speed. GDDR 5 is basically quad pumped, technically its not quite that simple but for the purpose of this its close enough so the effective clocks are 4x the actual clocks.

Mactronix

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tisello   07-31-2009 at 10:17:30 PM
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ah so the Sapphire would be 4.2GHZ if they wrote it the same way as xfx and PowerColor right?

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mactronix   07-31-2009 at 10:24:46 PM
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Yep that's it, don't know where you are looking but if you look online at New egg under 4890 1GB you will see some write it one way some do it the other.
The marketing guys think the bigger numbers will sway people

Mactronix

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tisello   07-31-2009 at 11:07:28 PM
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well it works :P it got me thinking that sapphire was crap. But infact it was 0.2GHZ better ^^

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trkorecky   07-31-2009 at 11:39:54 PM
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Sapphire cards are phenomenal, I've never had any issues with the ones I or my friends have used. From what I've read (granted it was back in the days when the 9800 Pro/XT were the top of the line, now they're just epic legends) Sapphire is one of the closest partners to ATI. Not sure how things are after the merger, but my 4870 X2 from them has never had any issues.

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