NVIDIA GRID K2

The NVIDIA GRID K2 is a dual-slot, end-of-life workstation accelerator built on the Kepler architecture, specifically the GK104 chip manufactured on TSMC's 28 nm process. It packs 3,540 million transistors onto a 294 mm² die, yielding a transistor density of 12.0M per mm², and it targets virtualized environments rather than direct desktop use, as indicated by its lack of display outputs. Its benchmark presence is modest, holding a 41st percentile ranking among all GPUs, with an average benchmark score of 8,075 across its Geekbench Metal and OpenCL tests.

Memory Subsystem

The GRID K2 comes equipped with 4 GB of GDDR5 memory across a 256-bit bus, delivering a bandwidth of 160.0 GB/s. The memory operates at 1250 MHz, translating to an effective data rate of 5 Gbps per pin. This configuration is modest by modern standards, but for its intended workload—virtualized graphics and compute in data centers—the capacity is more critical than raw speed. At high resolutions, the 160.0 GB/s bandwidth becomes a limiting factor; the data suggests that 4K or multi-monitor virtual desktops would strain the memory subsystem, potentially causing frame pacing issues in graphics-intensive scenarios. The 256-bit bus width is adequate for the 4 GB frame buffer, but the effective bandwidth is roughly half of what contemporary gaming GPUs of that era offered, meaning texture-heavy workloads at 1440p or above would likely see diminishing returns. For compute tasks that rely on large datasets residing in VRAM, the 4 GB capacity is a clear asset, allowing larger working sets to remain local, but the throughput ceiling of 160.0 GB/s caps sustained throughput in memory-bound kernels.

Ray Tracing and Feature Set

The GRID K2 is built on the Kepler architecture, which predates dedicated ray tracing and tensor core hardware; neither rtCores nor tensorCores are present in the specification. This is a significant limitation for any modern ray-traced workload, as there is no hardware acceleration for BVH traversal or denoising. The GPU does support a DirectX 12 feature level of 11_0, which means it can run DirectX 12 applications but only with the feature set of DirectX 11, lacking features like bindless resources or conservative rasterization that higher feature levels enable. The OpenGL support is listed at 4.6, and Vulkan support is at 1.2.175, both of which are mature API versions that allow for modern compute and graphics pipelines. The shading units number 1,536, alongside 128 texture mapping units and 32 render output units, producing a pixel rate of 23.84 GPixel/s and a texture rate of 95.36 GTexel/s. The FP32 compute throughput is 2.289 TFLOPS, which is respectable for the era but far below what modern accelerators achieve. In practice, the GRID K2 can handle legacy DirectX 11 titles and OpenGL workloads comfortably, but any ray-traced effects—even software-based implementations—would run on the general-purpose shaders, resulting in poor performance relative to even entry-level dedicated RT hardware.

Power and Cooling

The GRID K2 has a thermal design power (TDP) of 225 W, which is substantial for a dual-slot card but not extreme. The recommended power supply is rated at 550 W, and the card requires one 6-pin and one 8-pin power connector, indicating that it draws more than the 75 W supplied by the PCIe slot alone. The cooling solution is a dual-slot design, and the physical length is 267 mm, or 10.5 inches, which requires a reasonably spacious chassis. For a virtualized server environment, this power draw is manageable, but it does generate significant heat that must be exhausted effectively. The absence of display outputs means this is not a card for a standalone workstation; it is designed to be installed in a server chassis where cooling is handled by system fans. The 225 W TDP is notably higher than typical entry-level cards, and the data suggests that power delivery must be robust—the 550 W PSU recommendation accounts for the card's peak draw plus system overhead, though specific transient spikes are not documented. In a multi-GPU server configuration, the cumulative power and thermal load would require enterprise-grade cooling and power distribution.

How It Compares

Against the NVIDIA GeForce GTX 675MX, the GRID K2 is essentially tied, with a delta of -0.2% relative to the rival's average score of 8,094. This means the two perform within noise of each other in the aggregate benchmarks, despite the GRID K2's server-oriented design. The GTX 675MX is a mobile GPU, so the comparison underscores that the GRID K2's performance ceiling is roughly that of a high-end laptop part from the same generation, not a desktop flagship.

The NVIDIA GeForce 945M shows a similar situation, with a delta of -0.3% against its average score of 8,099. The 945M is a low-power mobile chip, yet it matches the GRID K2's compute output in these tests. This highlights that the GRID K2's value lies in its virtualization features and memory capacity, not raw speed, as a mainstream laptop GPU can match it in synthetic benchmarks.

The NVIDIA GeForce GTX 970 is a desktop part, and the GRID K2 actually edges it out by 0.6%, with the GTX 970 scoring 8,024. This is surprising given the GTX 970 is a newer architecture (Maxwell) and generally faster in gaming, but the aggregate benchmark scores here put them nearly identical. The GRID K2's advantage is marginal, suggesting that in compute workloads, the older Kepler architecture holds its own against a more modern mid-range desktop card.

The NVIDIA GeForce GTX 650 Ti is the weakest rival, with a score of 8,018, and the GRID K2 leads by 0.7%. The GTX 650 Ti is a budget desktop card, so the GRID K2's narrow victory is expected, but the small delta indicates that the GRID K2 does not dramatically outperform even entry-level desktop hardware in these benchmarks. The GRID K2's real differentiation is its 4 GB VRAM and server-oriented design, not processing speed, which is consistently just above or below these competitors.

Who Should Consider It

The benchmark data positions the GRID K2 as a card for virtualized infrastructure, not for direct gaming or workstation use. Its 41st percentile ranking and average score of 8,075 place it in the lower-mid tier of all GPUs, and its nearest rivals are a mix of mobile and budget desktop parts. For users running virtual desktops at 1080p resolution with moderate graphics settings, the GRID K2 provides sufficient compute headroom, as its scores are comparable to the GTX 675MX and 945M, both of which are capable of light gaming. However, at 1440p or higher, the 160.0 GB/s bandwidth and 2.289 TFLOPS FP32 throughput would struggle to maintain smooth framerates in modern titles, making it unsuitable for high-refresh or high-resolution virtual gaming. The 4 GB VRAM is a plus for multi-session virtual desktops, allowing several users to share the frame buffer, but the lack of RT cores and limited DirectX 11_0 feature level preclude any ray-traced content. Organizations deploying legacy OpenGL or DirectX 11 applications in a virtualized environment would find the GRID K2 adequate, especially given its mature Vulkan 1.2.175 and OpenGL 4.6 support. Conversely, users expecting modern gaming performance or compute-intensive AI workloads should look elsewhere, as the data shows the GRID K2 is effectively a mid-range part from 2013, suited only for niche server deployments where its specific feature set—dual-slot, no outputs, and 4 GB frame buffer—is a requirement rather than a preference.