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ATI HD 4850 GDDR4

Last response: in Graphics & Displays
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February 11, 2009 7:36:23 PM

I've been seeing at newegg a GDDR4 version of the HD 4850. Does anyone have a site where they have a benchmark comparison for GDDR3 and GDDR4. I would like to know if it is worth the extra 15 dollars to get GDDR4 instead. Thanks in advance!


More about : ati 4850 gddr4

February 11, 2009 7:53:59 PM

do you have link to the 4850?
February 11, 2009 8:08:06 PM

i doubt it would make a difference. the 3870's had GDDR4 and it didn't help it beat the 8800GT.
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February 11, 2009 8:58:47 PM

the HD4670 is a 128bit card anyway. Adding GDD4 memory to that card is pure marketing on the part of the vendor.
February 12, 2009 12:01:49 AM

well the 4850 and the 4870 are practically the same card, but the 4870's faster because of DDR5.
If this 4850 really is using DDR4, her performance maybe somewhere between standard 4850s and 4870s.
DDR4 coupled with 993Mhz of Memory speed makes it 2979 effective.
February 12, 2009 6:25:43 AM

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Newegg has the product. It may be a marketing thing, but I am wanting to see benchmarks. It's like what romulus47plus said, it could be in between. Check out the specs and see if it is worth it. I wouldn't mind spending a little extra for inbetween.
February 12, 2009 9:18:59 AM

Strange thing they don't have reviews. I think the card's rather interesting and should have somebody doing a review out of it.
February 12, 2009 1:50:32 PM

Quote:

I'd say its safe to bet it would be 10% faster. Since the 4870 is 20% faster with same core and GDDR5.


Hmm...I see your point, but you have to look at the actual memory clock speeds, not just the type of memory. This card with the GDDR4 is only 2000MHz. The GDDR3 version's speed is 1800MHz. The GDDR5 is clocked at 3600MHz. So, going by memory clock speeds only, an increase of about 10% is theoretically possible. However, keep in mind that the 4870's core speed is exactly 20% more than the 4850's (750MHz vs. 625MHz.) So really, for the most part, the GDDR5 memory does nothing for the 4870. I guess maybe its higher latencies offset its increase in raw clock speed, maybe?

To sum it all up, I'd say that the GDDR4 would do very little for the 4850. Maybe 5% extra performance at the very most. It might lower the power consumption as well, since I seem to remember reading that GDDR4 eats up less power then GDDR3.
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