Speculation: How good will a gddr4 4850 perform?

Well, here we go:

Use this formula for memory access bandwidth/capability:
(ddr# - 1) x single channel clock = effective clock
(Bus bandwidth / 8) x effective clock in ghz = overall capability

4670 = 2 x 1000mhz = 2000mhz -> 2ghz
9600gso = 2 x 900mhz = 1800mhz -> 1.8ghz
4850 = 2 x 993mhz = 1986mhz -> 1.986ghz
4870 = 4 x 900mhz = 3600mhz -> 3.6ghz
gtx280 = 2 x 1107 = 2214mhz -> 2.214ghz

4670 = (128/8) x 2 = 32 gb/s
9600gso = (192/8) x 1.8 = 43.2 gb/s
4850 = (256/8) x 1.986 = 62 gb/s
4870 = (256/8) x 3.600 = 115.2 gb/s
gtx280 = (512/8) x 2.214 = 141.7 gb/s

According to that site, the ddr4 ram runs at 2200mhz effective.

4850 ddr4 = (256/8) x 2.2 = 70.4 gb/s
So that's 70.4 gb/s compared to 62 gb/s for the memory.

Looks like someone got left with some GDDR4 on th ebooks that needed shifting. GDDR4 wasnt that great a step. Didnt stay about long did it.
Mactronix

i dont know much about the latencies from gddr3 to gddr5, but i was hoping (actually praying lol) this will put it nearer to the 4870 (especially when overclocked) or at least 10% faster compared to a superclocked 4850 ddr3. guess it wont happen.

thanks dagger for ultimately crushing and stepping on my dream lol, just kidding, thanks for those computation btw.

im PSU limited (supposed to buy the corsair tx-series as replacement from my vx450, with the help from people from the psu section, thanks), and budget limited and considering theres a bunch of games coming out, my 4870 dream is slowly melting away.

Itll show up when ocing this card, as the ram is already 10% faster, and thats where most of youre ocing is held back, as the core should do ok, and really shine without even ocing the ram

well i did a checked on corsair's website, their very own psu calculator page. when i post my specs it always shows the vx520 as the minimum.

anyway can you show me the review you're talking about? im just 70$ short (thanks cod5 for taking a chunk of my budget), i might get it after a week or two, depending on how good i am at spending my allowance lol.

The only instances where GDDR4 has been used is the 2xxx and 3xxx series, which doesnt show the improvements on higher clocked ram like the 4xxx series. The only difference between the 4850 and the 4870 is 20% on core and then the ram. The 4870 is more than 20% faster than the 4850......

The thing is those of us who know whats what know those ATI system requirements are a load of rubbish. Yes as a consientious forum member i realise that best practice is to follow the manufacturers requirements when recomending or sugesting stuff, However according to ATI the 3850 the 3870 and the 4850 all have the same requirements ??? Now a quick trip over to X-bit Labs or a similar site that records power requirements shows that to be far from the truth.

@ wh3resmycar,
At the end of the day its up to you, The safest route is indeed to go with the official Unit. Personally i would be happy with what you have. However please be sure that you yourself are happy with what you do and that you understand the reasons why. In other words dont just do it because i say so. Read the review i gave you weigh up the pro's and cons and decide for yourself which unit to use.

mactronix

@ mac

yup thats why im doing...

@spin

and thats a good timing for that food pyramid.. especially for me who's 5"10 and weighs 230lbs lol.

i swear i saw the 520w variation the first time i tried my spec on there. i mustve bumped my head hard before i did that, or maybe corsair did a minor update..

thanks mac.

If you want to know how it will perform look at the regular 4850s that have been factory overclocked to that speed. gddr4 offers zero speed advantage over gddr3, often times gddr3 can overclock further than gdd4, this is utterly pointless.