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-   -   Radeon VII @ newegg for 500 dollars US on 11-27 (https://www.mersenneforum.org/showthread.php?t=24979)

tServo 2019-11-27 14:49

Radeon VII @ newegg for 500 dollars US on 11-27
 
The title says it all.
I just ordered 2 @ 8:48 CST

kriesel 2019-11-27 16:06

[QUOTE=tServo;531564]The title says it all.
I just ordered 2 @ 8:48 CST[/QUOTE]That's for an XFX. I've had a lot of reliability problems with an XFX. It can do gpuowl 0.6 LL DC reliably, although most exponents' runs contain at least one recovered error logged, and that's with the memory speed dialed down to 95%. It seems not suitable for P-1, since there are not sufficient error checks included in the gpuowl P-1 code. (The P-1 algorithm is not as amenable to including checks as PRP or LL are.) As I recall woltman had a similar experience and ended up returning an XFX for exchange.
Good luck.

kriesel 2020-01-16 18:25

[QUOTE=tServo;531564]The title says it all.
I just ordered 2 @ 8:48 CST[/QUOTE]
Are yours reliable? What settings are you running them at, and on what OS and host system?

tServo 2020-01-17 00:40

[QUOTE=kriesel;535246]Are yours reliable? What settings are you running them at, and on what OS and host system?[/QUOTE]

Reliable enough. I run them straight out of the box, no tuning except for fans 100%.
They throw an error every so often.
I haven't had time to diddle with the settings but plan to do so now that I have gotten
some free time. They are in my dungeon, er basement which is 60 degrees F.

retina 2020-01-17 03:41

[QUOTE=tServo;535281]They throw an error every so often.[/QUOTE]That sounds bad.[QUOTE=tServo;535281]Reliable enough.[/QUOTE]I think you misspelled "Not very reliable". :rolleyes:

PhilF 2020-01-17 03:52

[QUOTE=tServo;535281]Reliable enough. I run them straight out of the box, no tuning except for fans 100%.
They throw an error every so often.
I haven't had time to diddle with the settings but plan to do so now that I have gotten
some free time. They are in my dungeon, er basement which is 60 degrees F.[/QUOTE]

Wow, that means they are running hot, loud, and power hungry. Getting some tuning done will reduce heat and almost certainly fix those errors.

PhilF 2020-01-18 15:36

As of this moment there is a used Radeon VII on eBay for $425. I don't know the seller, I just wanted to put out a heads-up in case someone is looking for a number cruncher.

EDIT: Gone.

kriesel 2020-01-18 15:49

[QUOTE=tServo;535281]They throw an error every so often.[/QUOTE]How often? I think the consensus is to be dissatisfied with something like one GEC error in normal PRP in a week or a month.

M344587487 2020-01-18 18:05

[QUOTE=tServo;535281]Reliable enough. I run them straight out of the box, no tuning except for fans 100%.
They throw an error every so often.
I haven't had time to diddle with the settings but plan to do so now that I have gotten
some free time. They are in my dungeon, er basement which is 60 degrees F.[/QUOTE]
[LIST][*]I suggest at least setting sclk to 4 which corresponds to a core speed underclock of ~1536 IIRC (resulting in a minor throughput loss for a major efficiency and noise/heat win). AMD like to push their stock GPU configuration beyond what is reasonable from an efficiency POV for the minor advantage of bragging rights on the box (that's partly why they have a reputation for releasing noisy inefficient junk, very backwards thinking). At sclk 4 you should be able to have --setfan at 100-120 for ~80C temps, less than 50% of full speed (100% is 255).[*]Beyond setting sclk you can overclock memory (mclk) from 1000 to up to 1200, but I found minimal gains above 1100. A memory OC is an easy win for throughput and efficiency. If you overclock voltage you should manually set the fans as I found that the auto fans wouldn't ramp up as high as required to stay under the default temp target with OC'd memory[*]The next step is undervolting, personally I wouldn't bother as each card has tuned voltage from the factory which is good enough to get reasonable efficiency without with the headache of potential instability but it depends on your specific card as to how effective manually undervolting is so YMMV.[/LIST]

ewmayer 2020-01-20 19:50

[QUOTE=PhilF;535429]As of this moment there is a used Radeon VII on eBay for $425. I don't know the seller, I just wanted to put out a heads-up in case someone is looking for a number cruncher.

EDIT: Gone.[/QUOTE]
Too late for me - I order an XFX R7 from Amazon for $550 on the 14th, just arrived this morning as it happens. But given how hit-or-miss even the new ones are - (per George: "I've had 4 and returned 2. Quality control may not be the best, but [$550] is a good price and Amazon was real good about the return") - I'd be very leery about trying to save a few bucks by buying used.

dcheuk 2020-01-20 21:09

[QUOTE=tServo;535281]Reliable enough. I run them straight out of the box, no tuning except for fans 100%.
[COLOR="Red"]They throw an error every so often.[/COLOR]
I haven't had time to diddle with the settings but plan to do so now that I have gotten
some free time. They are in my dungeon, er basement which is 60 degrees F.[/QUOTE]

I've been trying to gradually increase the frequency by trial and error. So far my `safe tunings' are as follows where ambient is at 21C +-2C:

1,1500mhz 850mv, memory at 1150mhz, sitting around 80C, usually no errors.
2,1480mhz 845mv, memory at 1050mhz, sitting around 82C, usually around 1-3 errors.

Tried numerous times above these threshold immediately gets like 20 errors for one exponent. LOL


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