1) Message boards : Graphics cards (GPUs) : PCIE Riser? (Message 39742)
Posted 1 day ago by Profile skgiven
Using one is likely to increase your error rate somewhat. They're not very reliable.

From past experience I would agree, but you can keep the slightly higher error rate down by using a good PSU, not overclocking, and running cool (which is easier anyway).
Well made (copper wire/connector) risers are ok, but there are some low-grade (cheap alloy) versions. If it looks as cheap as tin, it is.
As GPU's take power from the PCIE slot it's a good idea to get a riser with a power cable (often molex). This covers the PCIE power loss from the cable length and additional connection.
Overclocking on a riser would be pushing it, but I expect the Maxwell's are a lot more power resilient and reliable on a riser than the Keplers and previous generations.
2) Message boards : News : WARNING/CHALLENGE: VERY LONG WU (VERYLONG_CXCL12_confAna) (Message 39648)
Posted 5 days ago by Profile skgiven

6) Search the file for that GERARD_VERYLONG_CXCL12_confAna text we started with. There will be many search hits: we are looking for a <file>...</file> section like this:

<file> <name>2x23-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3250_0_9</name> <nbytes>0.000000</nbytes> <max_nbytes>128000000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file>

7) Make sure you have exactly the right section: the last number before </name> should be _9, and there should be an <upload_url> line.

8) Change the first three numbers after <max_nbytes> from 128 to 256. Just those three numbers - don't accidentally delete any punctuation, change the number of zeroes, or make any other change.

9) Repeat steps (6), (7) and (8) for each separate VERYLONG task that you have on the system.

10) Save the file, restart BOINC, and relax. All done.

Why is it that max_nbytes only needs to be change for the _9 file, and not the others? - TIA

<file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_1</name> <nbytes>0.000000</nbytes> <max_nbytes>50000000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_2</name> <nbytes>0.000000</nbytes> <max_nbytes>50000000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_3</name> <nbytes>0.000000</nbytes> <max_nbytes>50000000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_4</name> <nbytes>0.000000</nbytes> <max_nbytes>256000000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_5</name> <nbytes>0.000000</nbytes> <max_nbytes>10000000.000000</max_nbytes> <status>0</status> <gzip_when_done/> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_6</name> <nbytes>0.000000</nbytes> <max_nbytes>10000000.000000</max_nbytes> <status>0</status> <gzip_when_done/> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_7</name> <nbytes>0.000000</nbytes> <max_nbytes>10000000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_8</name> <nbytes>0.000000</nbytes> <max_nbytes>256000000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_9</name> <nbytes>0.000000</nbytes> <max_nbytes>256000000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_10</name> <nbytes>0.000000</nbytes> <max_nbytes>10000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file> <file> <name>2x10-GERARD_VERYLONG_CXCL12_confAna-0-1-RND3907_1_11</name> <nbytes>0.000000</nbytes> <max_nbytes>5000000.000000</max_nbytes> <status>0</status> <upload_url>http://www.gpugrid.org/PS3GRID_cgi/file_upload_handler</upload_url> </file>
3) Message boards : News : Important: No new work for pre-Fermi GPUs (Message 39565)
Posted 7 days ago by Profile skgiven
In terms of compute capability and performance/Watt anything before a GTX400 series GPU is like trying to crunch with a hot fossil.
You simply can't expect to advance science if you crunch with dark ages technology; everything that could be done pretty much was.

Don't feel obligated to crunch on new kit however, upgrade as and when you choose and contribute if and when you choose - it's your choice.
We experienced crunchers, mods and researchers just give free expert advice to people with a common interest - take it or leave it.
4) Message boards : Graphics cards (GPUs) : Big Maxwell GM2*0 (Message 39520)
Posted 10 days ago by Profile skgiven
CC5.5 would make sense.

To equal Kepler for DP performance a 3072shader GM200 card would need to have 1/4 DP capable shaders and then it would still be likely have a ~250W TDP. There would be no purpose in doing that (possibly 1/3 but I doubt it). So I agree that GM200 is probably not going to be a high end DP card to replace GK Titans, and is going to be a lot more like a GM104 than you would expect from a big version of Maxwell.
I'm just expecting a slightly more refined architecture tweaked to use up to 12GB DDR5 and not much else unless it adds DirectX 12.1, OpenGL 4.6, or some updated port version.

So 50% bigger than a GTX980, a 384bit bus, 12GB GDDR5 (& likely a 980Ti version with 6GB) and a fat price tag.

NV could still launch a 990 and another dual Titan at a later date; performances would be well spaced out.

According to NV, the successor to Maxwell will be Pascal (previously called Volta) and this is still due in 2016, so I think GM200 is 28nm and a 16nm Pascal is more likely than what would be a fourth generation Maxwell by then. 1/2 to 1/4 DP might reappear on 16nm.

Off topic, Pascal is supposed to introduce 3D memory and Unified memory (CPU can access it) and NVlink for faster GPU to CPU and GPU to GPU communications. These abilities will widen possible research boundaries, making large multi-protein complex modelling (and similar) more accurate and whole organelle modelling possible.
5) Message boards : Graphics cards (GPUs) : GTX 960 (Message 39517)
Posted 10 days ago by Profile skgiven

Probably an FOC, but if its a base clock, 1266 is 12.4% higher than that of a Ref. GTX980 (1126MHz), and I'm running a 970 at 1350, so that scales (1350*1.124) to >1500MHz.
6) Message boards : Graphics cards (GPUs) : Titan is Back X !!! (Message 39515)
Posted 10 days ago by Profile skgiven
Looks like 12GB of GDDR5@7GHz (H5GCQ4H24MFR R2C).

Thought these were only ~25% faster than GK Titans, so they weren't going to ship any time soon? Maybe NV wants/needs something to bridge the gap to 16nm (possibly 2016)?
7) Message boards : Graphics cards (GPUs) : GTX 960 (Message 39499)
Posted 12 days ago by Profile skgiven
An ASUS OC version has since appeared on a shipping manifest:

STRIX-GTX960-DC2OC-2GD5//GTX960,DVI,HDMI,DP 3, 2G,D5 90YV07N0 - M0NA00 ( ASUS ) VGA

One 6-pin power supply (75W) + 75W from the slot provides for up to 150W. An 8-pin model makes no sense; it's only half the size of a 980 which has a 165W TDP. It doesn't need a 'physical' 225W TDP.

My guess is that a reference design version would be somewhere around 95W.
Fully expect these to OC-boost to 1350+ and then some. 1500MHz might well be true but for here we will have to wait and see.
8) Message boards : Wish list : do not count AMD cards when limiting number of WU per client (Message 39496)
Posted 12 days ago by Profile skgiven
I think you would just need the following lines in the cc_config.xml file:
<exclude_gpu> <url>http://www.gpugrid.net/</url> <type>ATI</type> </exclude_gpu>

The format is,


9) Message boards : Graphics cards (GPUs) : Build 7 GPU (Message 39495)
Posted 12 days ago by Profile skgiven
Better off building two systems.
10) Message boards : Graphics cards (GPUs) : NVidia GPU Card comparisons in GFLOPS peak (Message 39493)
Posted 12 days ago by Profile skgiven
Not sure about installing the GPU without using a 6-pin connector, but in theory it should work. Until you started crunching it would not need much power and you could always power cap it using MSI Afterburner (or similar) before launching Boinc.

You would need 2 free molex sockets for this,

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