Bitcoin Forum
December 03, 2016, 04:36:19 AM *
News: Latest stable version of Bitcoin Core: 0.13.1  [Torrent].
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: 4870x2 vs 5870  (Read 1887 times)
jebathga
Newbie
*
Offline Offline

Activity: 12


View Profile
July 15, 2011, 02:22:30 AM
 #1

Trying to understand the technicial differances between both cards...

4870x2  =1600 Stream Processors               5870 =1600 Stream Processors

 85 Mhash/s Core 0  56-70 Mhash/s Core 1                  350-390 Mhash/s Core 0

 DDR3 with a 256x2 (512-bit bus)                                DDR5 with 256-bit bus 

 ROP's 16x2 (32)                                                        ROP's 32

 Texture Units 40x2 (80)                                             Texture Unites (80)

 32-bit floating point                                                   32-bit floating point
           
In nearly all directx 9 and 10 games the 4870x2 and 5870 are Neck in Neck.


It puzzles me that the 4870x2 does so very bad in compairison to the 5870 when memory speed and bandwith are absent requirments... only raw processing power is needed.  I would expect to lose a certain percentage of computing effecency between core 0 and core 1 on the 4870x2 but to have a 250% preformance difference in these 2 video cards?


Maybe we need someone who can write custom drivers or an application profile for bitcoin mining? Owning 4 of these cards myself, I would be willing to put up a bounty.
1480739779
Hero Member
*
Offline Offline

Posts: 1480739779

View Profile Personal Message (Offline)

Ignore
1480739779
Reply with quote  #2

1480739779
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1480739779
Hero Member
*
Offline Offline

Posts: 1480739779

View Profile Personal Message (Offline)

Ignore
1480739779
Reply with quote  #2

1480739779
Report to moderator
MelMan2002
Sr. Member
****
Offline Offline

Activity: 434



View Profile
July 29, 2011, 08:58:34 PM
 #2

This post should explain how to get your second core up to speed.  I don't, however, have an answer about why it is slower than the 5870.
deslok
Sr. Member
****
Offline Offline

Activity: 448


It's all about the game, and how you play it


View Profile
July 29, 2011, 09:58:08 PM
 #3

The 5870 includes more capabilities for compute since most of the miners were based on open cl it's that performance that's important.

"If we don't hang together, by Heavens we shall hang separately." - Benjamin Franklin

If you found that funny or something i said useful i always appreciate spare change
1PczDQHfEj3dJgp6wN3CXPft1bGB23TzTM
Miner99er
Sr. Member
****
Offline Offline

Activity: 310


View Profile
July 30, 2011, 03:36:13 AM
 #4

From what I understand... the HD4800 series has plenty of horsepower for OpenCL applications... unfortunately it was produced before OpenCL was fully developed. Hence there's some math functions that are virtualized in the Graphics cards main memory pool, and not the local caches that are in the core.

Which is why an 800SP 5770 walks all over an 800SP 4850,70,90 in terms of hashrate, and not necessarily graphics performance.

And mind you this is in general terms, I looked and I can't quote the article I read it in. But I was interested why the HD3000 series couldn't run OpenCL apps at all (no local cache, if you were wondering.)

Bought From Yochdogx2, Alexmat, SgtSpike, David_Benz, Beaflag VonRathburg, Slaveindebt, Cptmooseinc, Coinhoarder

Donations? SURE! 16foPr8FAjYXKL8ApQAzihnigXm1qNhi8Q

http://pyramining.com/referral/yfab9med7   
http://pyramining.com/referral/ahmc7en6z
http://pyramining.com/referral/pagndq4xc   
http://pyramining.com/referral/79b2gmrzx
http://pyramining.com/referral/e2ghz4asy
OmegaNemesis28
Sr. Member
****
Offline Offline

Activity: 280



View Profile WWW
July 30, 2011, 03:57:47 AM
 #5

I know it really sucks. You're better off selling all 3 4870x2s and getting two 5xxx cards. I only have one but I think I may just pony up the difference.

I'm not one for donations but if you must go ahead and I will keep you in mind. =)
http://payb.tc/omeganemesis28
Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!