Bitcoin Forum
December 02, 2016, 10:17:43 PM *
News: Latest stable version of Bitcoin Core: 0.13.1  [Torrent].
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Underclocking the Memory Frequency?  (Read 1541 times)
NeonFlash
Member
**
Offline Offline

Activity: 108


View Profile
September 29, 2011, 09:42:03 AM
 #1

I read in many places that the Memory Clock Frequency is downclocked to 300 Mhz. What is the reason behind this? Does it help in reducing some kind of overhead?

My assumption is that Memory Clock frequency doesn't play much of a role for a task like Bitcoin Mining. What matters more is the GPU core clock frequency and stream processors.

Also, will it help to reduce the operating temperature of the GPU by decreasing the Memory Clock Frequency?
1480717063
Hero Member
*
Offline Offline

Posts: 1480717063

View Profile Personal Message (Offline)

Ignore
1480717063
Reply with quote  #2

1480717063
Report to moderator
1480717063
Hero Member
*
Offline Offline

Posts: 1480717063

View Profile Personal Message (Offline)

Ignore
1480717063
Reply with quote  #2

1480717063
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1480717063
Hero Member
*
Offline Offline

Posts: 1480717063

View Profile Personal Message (Offline)

Ignore
1480717063
Reply with quote  #2

1480717063
Report to moderator
1480717063
Hero Member
*
Offline Offline

Posts: 1480717063

View Profile Personal Message (Offline)

Ignore
1480717063
Reply with quote  #2

1480717063
Report to moderator
1480717063
Hero Member
*
Offline Offline

Posts: 1480717063

View Profile Personal Message (Offline)

Ignore
1480717063
Reply with quote  #2

1480717063
Report to moderator
dark_silverstar
Member
**
Offline Offline

Activity: 76



View Profile
September 29, 2011, 09:46:40 AM
 #2

not only reducing temperature, also reduce wattage as well  Grin
NeonFlash
Member
**
Offline Offline

Activity: 108


View Profile
September 29, 2011, 09:56:57 AM
 #3

Do you mean that decreasing the Memory Clock Frequency will help in reducing the voltage as well besides the operating temperature? Any stats that go along with it as an example?
DeathAndTaxes
Donator
Legendary
*
Offline Offline

Activity: 1218


Gerald Davis


View Profile
September 29, 2011, 10:18:43 PM
 #4

It varies from card to card.  Best thing to do is test yourself.

I have a 3x5970 water cooled rigs.  With memory at full speed temps are 30C over ambient and it pulls 1080W at the wall.  With core overclocked to 900MHz (from 735MHz) and memory underclocked to 200MHz temps are 24C over ambient and it pulls 960 at the wall.

Best thing you can is experiment yourself.

Use a wall meter like Kill-a-watt, and set fan to static speed (say 70%) to record temps. 

Set it to one setting, run miner for 3 hours (for good sample size).  record temp, kWh used, and temp.  Adjust memory clock and repeat.
ssateneth
Legendary
*
Offline Offline

Activity: 1288



View Profile
October 01, 2011, 01:43:53 AM
 #5

In addition to using less power (which means lower electricity bill = more net profit), there are certain memory timing thresholds at certain frequencies, as well as a few peaks of performance relating to worksize. I did an exhaustive amount of benches at various memory speeds. It's a little out of date and I really should run it on current kernels.

https://docs.google.com/spreadsheet/ccc?key=0AjXdY6gpvmJ4dEo4OXhwdTlyeS1Vc1hDWV94akJHZFE&hl=en_US#gid=0

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!