mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Hardware

Reply
 
Thread Tools
Old 2021-03-06, 19:04   #12
Primeinator
 
Primeinator's Avatar
 
"Kyle"
Feb 2005
Somewhere near M52..

3×5×61 Posts
Default

Quote:
Originally Posted by M344587487 View Post
[*]The one forumite that's publically tried Big Navi sold it in frustration due to technical issues, it's only an option if don't mind being a canary. And if you have deep pockets
It looks like the 6900 XT is one of these "Big Navi"? What kind of issues did he/she have?
Primeinator is offline   Reply With Quote
Old 2021-03-07, 11:26   #13
M344587487
 
M344587487's Avatar
 
"Composite as Heck"
Oct 2017

14278 Posts
Default

Big Navi is all RDNA2 to date, 6800/6800XT/6900. The upcoming 6700XT may or may not be under that umbrella, the others were called big navi because they have more than the 40 CU's of the 5700/XT but the 6700XT is a direct replacement with 40 CU's.



Starting from this post in that thread xyzzy documented their efforts: https://mersenneforum.org/showpost.p...&postcount=103



Their problem may or may not have been resolved by the power cycling code that was implemented after they'd gotten rid of the card. AFAIK no one else has acquired a card since to test.
M344587487 is offline   Reply With Quote
Old 2021-03-07, 15:24   #14
Primeinator
 
Primeinator's Avatar
 
"Kyle"
Feb 2005
Somewhere near M52..

16238 Posts
Default

Quote:
Originally Posted by M344587487 View Post
Big Navi is all RDNA2 to date, 6800/6800XT/6900. The upcoming 6700XT may or may not be under that umbrella, the others were called big navi because they have more than the 40 CU's of the 5700/XT but the 6700XT is a direct replacement with 40 CU's.



Starting from this post in that thread xyzzy documented their efforts: https://mersenneforum.org/showpost.p...&postcount=103



Their problem may or may not have been resolved by the power cycling code that was implemented after they'd gotten rid of the card. AFAIK no one else has acquired a card since to test.
*googles 'CU's*
What is the significance of this? Per the link it looks like Xyzzy was getting the expected microseconds/iteration George provided in his link... or should it have been faster than this?

Last fiddled with by Primeinator on 2021-03-07 at 15:47
Primeinator is offline   Reply With Quote
Old 2021-03-07, 21:49   #15
M344587487
 
M344587487's Avatar
 
"Composite as Heck"
Oct 2017

7×113 Posts
Default

A CU is a compute unit, a cluster of cores and some other bits. Similar to how Nvidia talks in SM's. You can only directly compare SM's or CU's in relation to other cards in the same generation.



IIRC Xyzzy's issue was that for some reason the card failed to queue new work and needed resetting every day or so. Details in the thread: https://mersenneforum.org/showthread...679#post568679
M344587487 is offline   Reply With Quote
Old 2021-03-08, 15:39   #16
Primeinator
 
Primeinator's Avatar
 
"Kyle"
Feb 2005
Somewhere near M52..

3·5·61 Posts
Default

Quote:
Originally Posted by M344587487 View Post
A CU is a compute unit, a cluster of cores and some other bits. Similar to how Nvidia talks in SM's. You can only directly compare SM's or CU's in relation to other cards in the same generation.



IIRC Xyzzy's issue was that for some reason the card failed to queue new work and needed resetting every day or so. Details in the thread: https://mersenneforum.org/showthread...679#post568679
I imagine then that the 6900 XT is similar enough it would be plagued with a similar problem?
Primeinator is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
What percentage of CPUs/GPUs have done a double check? Mark Rose Data 4 2016-06-17 14:38
How should we compare GPUs to CPUs? chalsall GPU to 72 56 2012-07-15 19:24
LMH Factoring on GPUs Uncwilly LMH > 100M 60 2012-05-15 08:37
GPUs vs. Cellphone GSM Rodrigo GPU Computing 2 2011-07-14 07:48
GPUs in action? davieddy PrimeNet 21 2011-04-02 12:33

All times are UTC. The time now is 04:30.

Fri Apr 23 04:30:39 UTC 2021 up 14 days, 23:11, 0 users, load averages: 1.40, 1.65, 1.78

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.