4850@750Mhz vs 4870

[gurusan]

another member and I ran some CoH benches on another forum and compared results. Remember his memory bandwidth is x4 effective, mine is x2 effective.

These are our quick results.

[dnottis]

You must have goofed and copied the old picture onto your new post instead of the other way around; your new numbers are the same as the old numbers. 22.575 average.

Refresh - your browser is pulling the jpg from the cache. The name is the same so the pic isnt getting updated on your browser

[zaraza]

another member and I ran some CoH benches on another forum and compared results. Remember his memory bandwidth is x4 effective, mine is x2 effective.

These are our quick results.

That is perfect!!! im gonna go ahead and order a 4850 for 150 AR if its still instock after class. I got an S1 so its not gonna be a problem

[gurusan]

this is only from 1 game. another game may tell a different story. also for reference it was the DX9 demo i think, 1680x1050, everything maxed and AA "enabled" (either enabled/disabled, dunno how many multisamples it set it to)

[jaredpace]

my guess is that having GDDR5 is only adding 3-7% performance in most benchmarks between the 4850 & 4870. since both use Rv770's then why not get 1 or 2 of the cheaper 4850's and biosmod to use Vgpu high enough for 900mhz core...

Granted you may need a fan fix/ aftermarket air/ or water cooling solution

[gurusan]

you can only turn the voltage up to 1.20 through the bios on the 4850

[Truckchase!]

Here you guys go... let me know if you need any help interpreting the graphs; I didn't polish them up yet.

http://www.xtremesystems.org/forums/...d.php?t=193085

2nd post is memory/gpu bottleneck data.

Comments welcome.

[jaredpace]

you can only turn the voltage up to 1.20 through the bios on the 4850

what kinda volts do you need for 800mhz, and do you have to do a solder voltmod? or can something be done through software?

so you did a pencil mod? & 800mhz requires ~ 1.3 volts?

[gurusan]

800mhz you will probably need around 1.26-1.3

check the voltmod thread for more info

[zaraza]

are there any other game tests you can run? with your friend? I really like that graph. I am about to purchase a 4850, i want to pencil mod it too. I saw that on the pencil mod guide, you cant get higher than 1.4 volts. Is that true?

[kryptobs2000]

I'd be more interested in seeing benches at 1920x1200+ and with & w/o antialiasing. I'm sure the bandwidth would be much more helpful there, and that's what I game at. I can't imagine people buying these cards to play at low resolutions ( < 1650x1050) and w/o AA/AF.

[aldamon]

another member and I ran some CoH benches on another forum and compared results. Remember his memory bandwidth is x4 effective, mine is x2 effective.

Did you guys have the same CPU platform and overclock?

[S_G]

Wow, that is slick. Thanks for the data. Very glad I adopted the 4850s early. Seems like I was right about the 4870 not really being worth the extra cash.

[Theta]

Everybody has asked for high res differences... so here we go... Some raw data between overclocked 4850 Crossfire and overclocked 4870 Crossfire...

2560 x 1600 Call of Duty 4 (COD4)

4850 Crossfire @ 800/1100 = Avg 96.40 FPS

2008-07-01 22:07:13 - iw3sp
Frames: 11463 - Time: 118299ms - Avg: 96.898 - Min: 46 - Max: 156

2008-07-01 22:10:48 - iw3sp
Frames: 11616 - Time: 121112ms - Avg: 95.911 - Min: 52 - Max: 162

4870 Crossfire @ 790/1000 = Avg 105.68 FPS -- 9.63% Faster than 4850 CF

2008-07-01 22:26:05 - iw3sp
Frames: 12419 - Time: 117629ms - Avg: 105.577 - Min: 51 - Max: 163

2008-07-01 22:33:31 - iw3sp
Frames: 12506 - Time: 118234ms - Avg: 105.773 - Min: 54 - Max: 160

4870 Crossfire @ 790/1100 = Avg 109.14 FPS -- 13.22% Faster than 4850 CF

2008-07-01 23:47:49 - iw3sp
Frames: 12648 - Time: 116528ms - Avg: 108.540 - Min: 51 - Max: 198

2008-07-01 23:51:22 - iw3sp
Frames: 13063 - Time: 119035ms - Avg: 109.740 - Min: 45 - Max: 185

These are just rough numbers, but it goes to show a few more things regarding upper-end clock speed, etc.

[purecain]

interesting thread, good info m8... keep it coming....

[adamsleath]

interesting results, good work.

Everybody has asked for high res differences

with AA ?

109 vs 95 fps....4870cf vs 4850cf
this may be more relevant if comparing 39fps to 25fps(for hypothetical example) in some heavily graphics bound app/settings/AA/etc. situation., but that is my question.

ie4870cf may pull away more from 4850cf in some hypothetical grfx bound situation...yada.anyway thats wot id like to see.(bandwidth advantage/disadvantage)

[gurusan]

weeeeeeeEeeee!

[zaraza]

what speed is your card at for that pic, gurusan?

[Cooper]

http://www.ixbt.com/video3/rv770-2-part3-d.shtml#p18

[aldamon]

http://www.ixbt.com/video3/rv770-2-part3-d.shtml#p18

Indeed. Sub-$150 4850 FTW.

[Jim Morbid]

Interesting... Maybe 3 way crossfire 4850's against a pair of 4870's?

JM

[aldamon]

English translation posted:

http://www.digit-life.com/articles3/...-part1-p4.html

We have also analyzed the effect of memory bandwidth on performance. The charts include results of the HD 4870 operating at 625 MHz (like HD 4850), memory frequency being the same 900 (3600) MHz. The results were quite surprising. In most cases performance didn't depend on memory bandwidth, being limited by GPU. Thus, we retract words about HD 4850 being cut down much in terms of memory bandwidth, and that increasing memory frequency would strongly benefit its performance. Turns out we were wrong.

[regenade]

I have done a review on the Sapphire HD 4870 against the Palit HD 4850 clocked @ 800 core/1150 mem . Performance is almost 5-7% within each other

http://www.techenclave.com/reviews-a...ew-115201.html

[pauldovi]

I have done a review on the Sapphire HD 4870 against the Palit HD 4850 clocked @ 800 core/1150 mem . Performance is almost 5-7% within each other

http://www.techenclave.com/reviews-a...ew-115201.html

I started to read it but the ads were too much.

[binormalkilla]

Well if anyone needs data at 1920x1080 I have my cards installed, but they're yet to be OCed......I'm going to flash 1.20V to them and see how high that takes me. I'm on MCW60s so they should scale as much as the voltage will allow.