The model allocated to a session may be any of the following. There is currently no way to select a model or indicate a gpu-model preference or requirement. (There are reports of V100 in the paid tier, but I have no data on it from the free tier.)
I think all prices below are used.
Code:
Tesla P100 https://www.techpowerup.com/gpu-specs/tesla-p100-pcie-16-gb.c2888
16GB HBM2 732 GB/sec dual-slot 250W FP64 4.763 TFLOPS (1/2)
1175 GhzD/day TF, 173.4 LL(95M)
$600 on eBay
indicates 0 of 16280 MiB allocated at Colab notebook launch
Tesla P4 https://www.techpowerup.com/gpu-specs/tesla-p4.c2879
8GB 192 GB/sec single-slot 75W FP64 178.2 GFLOPS (1/32)
512 GhzD/day TF, 32.5 LL (95M)
$280 on eBay
indicates 0 of 7611 MiB allocated at Colab notebook launch
Tesla K80 (note, dual gpu, specs below are per card not per gpu; Colab free session may include single gpu but not dual)
12GBx2, 240.6 GB/sec x2, dual-slot 300W FP64 1371 GFLOPS (1/3)
766.7 GhzD/day TF, 115.1 LL (95M)
$230 on eBay
indicates 0 of 11441 MiB allocated at Colab notebook launch
Tesla T4
16GB 320 GB/sec single-slot 70W FP64 254.4 GFLOPS (1/32)
2467. GhzD/day TF, 59.3 LL (95M)
$355 on eBay
indicates 0 of 15079 MiB allocated at Colab notebook launch
Tesla V100
16GB HBM2 897 GB/sec mezzanine or dual-slot 250W FP64 7.834 TFLOPS (1/2) https://www.techpowerup.com/gpu-specs/tesla-v100-sxm2-16-gb.c3018
4162. GhzD/day TF, 221 LL (95M)
$2400 on eBay
(never seen one of these in Colab free myself)
NVIDIA Tesla A100 https://www.techpowerup.com/gpu-specs/a100-pcie.c3623
40GiB HBM2e vram, 1555 GB/sec, dual-slot 250W FP64 9.746 TFLOPS (1/2)
6707 GHD/day TF, 746. GHD/day LL/PRP (100M)
$9400 on eBay
(never seen one of these in Colab free myself)
The above are all passively cooled (no integral fans), requiring either a server case with high pressure blowers, or aftermarket addon blowers & adapters.
Compare to:
Code:
Tesla C2075
6 GB 144 GB/sec dual-slot 247W FP64 515.2 GFLOPS (1/2)
282.2 GhzD/d TF, 22.2 LL (95M)
$175 on eBay
Radeon VII:
16 GB HBM2 1024 GB/sec dual-slot 295W FP64 3.36 TFLOPS (1/4)
1113.6 TF, 280.9 LL (95M); there are reports of >500 in PRP in Linux with ram overclocking to 1200 MHz; I've myself observed in Windows, ~1800 TF (Mfakto), ~400 PRP (Gpuowl v6.11-380)
$1200+ on eBay
RTX2080:
8GB 448 GB/sec dual-slot 215W FP64 314.6 GFLOPS (1/32)
2703 GHzD/d TF, 65 LL (95M)
$750 on eBay
Note: in gpuowl, use -maxAlloc m, where m is megabytes limit per gpuowl instance, g is free megabytes on the idle gpu, n is number of gpuowl instances per gpu, b = 1000 or perhaps more if there are problems at 1000;
m<=(g -b)/n.
Or go higher when using multiple instances per gpu and memlock and -pool in gpuowl V7
Note 2: the above prices are as of the original post date, and have changed considerably since.
Top of this reference thread:
https://www.mersenneforum.org/showthread.php?t=24839
Top of reference tree:
https://www.mersenneforum.org/showpo...22&postcount=1