NVIDIA’s Tesla K20 GPU is currently the de facto standard for high-performance heterogeneous computing. Based upon the Kepler GK110 architecture, these are the GPUs you want if you’ll be taking advantage of the latest advancements available in CUDA 5.0 and CUDA 5.5. This generation was designed specifically for the exciting new features in CUDA such as dynamic parallelism.
With 5GB or 6GB of GDDR5 memory, they provide up to 3.95 TFLOPS single-precision and 1.33 TFLOPS double-precision floating point performance. Two variants of the GPU are available: K20 (available for workstations and servers) and K20X (available only for servers). Here are the full specifications:
Tesla K20 GPU Specifications
NVIDIA Tesla K20 GPU Accelerator
Integrated in Microway NumberSmasher and Navion GPU Workstations, Servers and GPU Clusters
Specifications
- 2496 CUDA cores
- 3.52 TFLOPS single, 1.17 TFLOPS double
- 5GB GDDR5 memory
- Memory bandwidth up to 208GB/sec
- PCI-E x16 Gen2 interface to system
- Supports Dynamic Parallelism and HyperQ features
- Passive (K20m) or active (K20c) heatsink options for servers and workstations
Tesla K20X GPU (peak performance) Specifications
NVIDIA Tesla K20X GPU Accelerator
Integrated in Microway NumberSmasher and Navion GPU Servers and GPU Clusters
Specifications
- 2688 CUDA cores
- 3.95 TFLOPS single, 1.32 TFLOPS double
- 6GB GDDR5 memory
- Memory bandwidth up to 250GB/sec
- PCI-E x16 Gen2 interface to system
- Supports Dynamic Parallelism and HyperQ features
- Passive heatsink relies on chassis cooling of specially-designed GPU servers
Technical Details
For the technically-minded audience, here is the full information dump from nvidia-smi
on Tesla K20 and K20X GPUs:
nvidia-smi: Tesla K20
==============NVSMI LOG============== Timestamp : Thu Jul 18 12:16:49 2013 Driver Version : 310.32 Attached GPUs : 1 GPU 0000:02:00.0 Product Name : Tesla K20m Display Mode : Disabled Persistence Mode : Enabled Driver Model Current : N/A Pending : N/A Serial Number : 033421200xxxx GPU UUID : GPU-dcf6d5d9-6a9e-xxxx-xxxx-e561b7xxxxxx VBIOS Version : 80.10.11.00.06 Inforom Version Image Version : 2081.0208.01.07 OEM Object : 1.1 ECC Object : 3.0 Power Management Object : N/A GPU Operation Mode Current : Compute Pending : Compute PCI Bus : 0x02 Device : 0x00 Domain : 0x0000 Device Id : 0x102810DE Bus Id : 0000:02:00.0 Sub System Id : 0x101510DE GPU Link Info PCIe Generation Max : 2 Current : 1 Link Width Max : 16x Current : 16x Fan Speed : N/A Performance State : P8 Clocks Throttle Reasons Idle : Active User Defined Clocks : Not Active SW Power Cap : Not Active HW Slowdown : Not Active Unknown : Not Active Memory Usage Total : 5119 MB Used : 13 MB Free : 5106 MB Compute Mode : Default Utilization Gpu : 0 % Memory : 0 % Ecc Mode Current : Disabled Pending : Disabled ECC Errors Volatile Single Bit Device Memory : N/A Register File : N/A L1 Cache : N/A L2 Cache : N/A Texture Memory : N/A Total : N/A Double Bit Device Memory : N/A Register File : N/A L1 Cache : N/A L2 Cache : N/A Texture Memory : N/A Total : N/A Aggregate Single Bit Device Memory : N/A Register File : N/A L1 Cache : N/A L2 Cache : N/A Texture Memory : N/A Total : N/A Double Bit Device Memory : N/A Register File : N/A L1 Cache : N/A L2 Cache : N/A Texture Memory : N/A Total : N/A Temperature Gpu : 23 C Power Readings Power Management : Supported Power Draw : 11.93 W Power Limit : 225.00 W Default Power Limit : 225.00 W Min Power Limit : 150.00 W Max Power Limit : 225.00 W Clocks Graphics : 324 MHz SM : 324 MHz Memory : 324 MHz Applications Clocks Graphics : 705 MHz Memory : 2600 MHz Max Clocks Graphics : 758 MHz SM : 758 MHz Memory : 2600 MHz Compute Processes : None
==============NVSMI LOG============== Timestamp : Tue Dec 3 12:54:39 2013 Driver Version : 325.15 Attached GPUs : 3 GPU 0000:02:00.0 Supported Clocks Memory : 2600 MHz Graphics : 758 MHz Graphics : 705 MHz Graphics : 666 MHz Graphics : 640 MHz Graphics : 614 MHz Memory : 324 MHz Graphics : 324 MHz
nvidia-smi: Tesla K20X
==============NVSMI LOG============== Timestamp : Wed Nov 27 15:47:57 2013 Driver Version : 319.37 Attached GPUs : 1 GPU 0000:02:00.0 Product Name : Tesla K20Xm Display Mode : Disabled Display Active : Disabled Persistence Mode : Enabled Accounting Mode : Disabled Accounting Mode Buffer Size : 128 Driver Model Current : N/A Pending : N/A Serial Number : 032351309xxxx GPU UUID : GPU-23d6aecc-4996-d45a-a68c-15a69e0fxxxx VBIOS Version : 80.10.39.00.02 Inforom Version Image Version : 2081.0200.01.09 OEM Object : 1.1 ECC Object : 3.0 Power Management Object : N/A GPU Operation Mode Current : Compute Pending : Compute PCI Bus : 0x02 Device : 0x00 Domain : 0x0000 Device Id : 0x102110DE Bus Id : 0000:02:00.0 Sub System Id : 0x097D10DE GPU Link Info PCIe Generation Max : 2 Current : 1 Link Width Max : 16x Current : 16x Fan Speed : N/A Performance State : P8 Clocks Throttle Reasons Idle : Active Applications Clocks Setting : Not Active SW Power Cap : Not Active HW Slowdown : Not Active Unknown : Not Active Memory Usage Total : 5759 MB Used : 12 MB Free : 5747 MB Compute Mode : Default Utilization Gpu : 0 % Memory : 0 % Ecc Mode Current : Enabled Pending : Enabled ECC Errors Volatile Single Bit Device Memory : 0 Register File : 0 L1 Cache : 0 L2 Cache : 0 Texture Memory : 0 Total : 0 Double Bit Device Memory : 0 Register File : 0 L1 Cache : 0 L2 Cache : 0 Texture Memory : 0 Total : 0 Aggregate Single Bit Device Memory : 0 Register File : 0 L1 Cache : 0 L2 Cache : 0 Texture Memory : 0 Total : 0 Double Bit Device Memory : 0 Register File : 0 L1 Cache : 0 L2 Cache : 0 Texture Memory : 0 Total : 0 Retired Pages Single Bit ECC : 0 Double Bit ECC : 0 Pending : No Temperature Gpu : 27 C Power Readings Power Management : Supported Power Draw : 30.88 W Power Limit : 235.00 W Default Power Limit : 235.00 W Enforced Power Limit : 235.00 W Min Power Limit : 150.00 W Max Power Limit : 235.00 W Clocks Graphics : 324 MHz SM : 324 MHz Memory : 324 MHz Applications Clocks Graphics : 732 MHz Memory : 2600 MHz Default Applications Clocks Graphics : 732 MHz Memory : 2600 MHz Max Clocks Graphics : 784 MHz SM : 784 MHz Memory : 2600 MHz Compute Processes : None
==============NVSMI LOG============== Timestamp : Wed Nov 27 15:49:32 2013 Driver Version : 319.37 Attached GPUs : 1 GPU 0000:02:00.0 Supported Clocks Memory : 2600 MHz Graphics : 784 MHz Graphics : 758 MHz Graphics : 732 MHz Graphics : 705 MHz Graphics : 666 MHz Graphics : 640 MHz Graphics : 614 MHz Memory : 324 MHz Graphics : 324 MHz
CUDA Device Query for Tesla K20
NVIDIA’s deviceQuery utility (from the CUDA SDK examples) demonstrates how applications can query the capabilities of a CUDA-capable GPU. This utility also gives valuable details about the Tesla GPU products.
nvidia-smi: Tesla K20
deviceQuery Starting... CUDA Device Query (Runtime API) version (CUDART static linking) Detected 1 CUDA Capable device(s) Device 0: "Tesla K20m" CUDA Driver Version / Runtime Version 5.5 / 5.5 CUDA Capability Major/Minor version number: 3.5 Total amount of global memory: 5120 MBytes (5368512512 bytes) (13) Multiprocessors, (192) CUDA Cores/MP: 2496 CUDA Cores GPU Clock rate: 706 MHz (0.71 GHz) Memory Clock rate: 2600 Mhz Memory Bus Width: 320-bit L2 Cache Size: 1310720 bytes Maximum Texture Dimension Size (x,y,z) 1D=(65536), 2D=(65536, 65536), 3D=(4096, 4096, 4096) Maximum Layered 1D Texture Size, (num) layers 1D=(16384), 2048 layers Maximum Layered 2D Texture Size, (num) layers 2D=(16384, 16384), 2048 layers Total amount of constant memory: 65536 bytes Total amount of shared memory per block: 49152 bytes Total number of registers available per block: 65536 Warp size: 32 Maximum number of threads per multiprocessor: 2048 Maximum number of threads per block: 1024 Max dimension size of a thread block (x,y,z): (1024, 1024, 64) Max dimension size of a grid size (x,y,z): (2147483647, 65535, 65535) Maximum memory pitch: 2147483647 bytes Texture alignment: 512 bytes Concurrent copy and kernel execution: Yes with 2 copy engine(s) Run time limit on kernels: No Integrated GPU sharing Host Memory: No Support host page-locked memory mapping: Yes Alignment requirement for Surfaces: Yes Device has ECC support: Disabled Device supports Unified Addressing (UVA): Yes Device PCI Bus ID / PCI location ID: 2 / 0 Compute Mode: < Default (multiple host threads can use ::cudaSetDevice() with device simultaneously) > deviceQuery, CUDA Driver = CUDART, CUDA Driver Version = 5.5, CUDA Runtime Version = 5.5, NumDevs = 1, Device0 = Tesla K20m Result = PASS
Usage Differences for Tesla K20 vs K20X
It’s worth noting that there are different versions of the Tesla GPU products depending on the type of installation. For Tesla K20 we can provide anything from quiet workstations to full compute clusters. For the higher-performing Tesla K20X the options are limited. In particular, it’s not possible to provide a workstation which is quiet.
If a tower/workstation form-factor is required, we do have one available. Unfortunately, it’s rather noisy. There is no quiet configuration on the market for Tesla K20X. Please contact one of Microway’s HPC experts if you would like to discuss the alternatives.
For those curious as to why there are two separate product versions, it’s simply a question of optimized cooling. Take a look at our GPU servers and you’ll see that airflow is carefully channeled through the GPU slots. This provides the best possible cooling for dense installations, but simply doesn’t cool properly in workstation configurations. For workstations, actively-cooled versions are available for many GPUs.