GeForce GT 645
NVIDIA
G3D Mark
2,006
MSRP
$99
AVG Price
$15
Performance Spectrum - GPU
About G3D Mark
G3D Mark is a standard benchmark that measures graphics performance in real-world gaming scenarios. It simplifies comparing cards from different brands, where higher scores directly correlate with better fps and smoother gaming experiences.
Overview
The GeForce GT 645 is manufactured by NVIDIA. It was released in October 1 2012. It features the Kepler architecture. The core clock speed is Up to 710 MHz. It has 384 shading units. The thermal design power (TDP) is 32W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 2,006 points.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (G3D Mark) per dollar. The GeForce GT 645 is positioned at rank #242 in our cost-efficiency ranking, representing a Lower cost-benefit for your build. Components placed above yours deliver better value for money.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar GeForce GT 645
FPS Benchmarks
Predicted performance for GeForce GT 645 across popular games. Tested paired with Ryzen 7 7800X3D to isolate GPU performance.
Path of Exile 2
Counter-Strike 2
League of Legends
Valorant
Technical Analysis
Detailed breakdown of GeForce GT 645 specifications and capabilities.
Graphics Performance
The GeForce GT 645 scores 2,006 in the G3D Mark benchmark (the standard measure of rasterization GPU performance), placing it in the Entry Level tier as a Legacy generation graphics card. It is built on the Kepler (2012−2018) architecture (codename: GK107), manufactured on a 28 nm process— smaller process nodes improve power efficiency and transistor density. It packs 384 shader units (the primary compute units for rendering pixels), 32 TMUs (texture mapping units), and 16 ROPs (render output units that handle final pixel output). Raw FP32 compute power: 0.5445 TFLOPS — this measures the theoretical peak floating-point performance.
| Specification | GeForce GT 645 |
|---|---|
| G3D MarkPassMark 3D graphics benchmark score | 2,006 |
| ArchitectureGPU microarchitecture generation | Kepler (2012−2018) |
| CodenameInternal GPU die codename | GK107 |
| Manufacturing ProcessFabrication node — smaller = more efficient | 28 nm |
| Shader UnitsCore compute units for rendering/compute | 384 |
| TMUsTexture Mapping Units — handle texture sampling | 32 |
| ROPsRender Output Units — final pixel/color blending | 16 |
| Base ClockGuaranteed minimum GPU frequency | Up to 710 MHz |
| Compute (FP32)Peak single-precision floating-point performance | 0.5445 TFLOPS |
| Texture Fill RateTextures processed per second | 22.69 GTexel/s |
| PCIe InterfaceCPU↔GPU data link generation | PCIe 3.0 x16 |
| Transistor Count | 1,270 million |
| Performance RankPosition in global GPU performance ranking | #903 |
Video Memory (VRAM)
The GeForce GT 645 is equipped with 2 GB of GDDR5 video memory connected via a 128-bit memory bus, delivering Unknown of bandwidth. Memory operates at 8 Gbps effective speed.
| Specification | GeForce GT 645 |
|---|---|
| VRAM SizeVideo memory capacity — more = better for high-res textures | 2 GB |
| VRAM TypeMemory technology generation | GDDR5 |
| Memory BusWidth of data path — wider = more bandwidth | 128-bit |
| Memory SpeedEffective memory data rate | 8 Gbps |
| BandwidthMaximum data throughput between GPU and VRAM | Unknown |
| L1 Cache | 32 kB |
| L2 Cache | 256 kB |
Advanced Features & APIs
Graphics API support: DirectX 12 (11_0), Vulkan 1.2, OpenGL 4.6— latest API versions enable the most advanced rendering features like ray tracing and mesh shaders.
| Specification | GeForce GT 645 |
|---|---|
| NVIDIA Reflex | ❌ Not Supported |
| DLSS Frame Generation | ❌ Not Supported |
| DLSS Super Resolution | ❌ Not Supported |
| DirectXMicrosoft graphics API version | 12 (11_0) |
| VulkanCross-platform graphics API | 1.2 |
| OpenGLLegacy graphics API | 4.6 |
| Compute APIGPGPU framework (CUDA/ROCm/OpenCL) | CUDA 3.0 |
| Multi-GPUSLI/CrossFire/NVLink support | None |
Display & Media
Display outputs: DVIx 0, HDMIx 1, DisplayPortx 2 — supports up to 3 simultaneous displays. Hardware encoder: NVENC (1st Gen), decoder: NVDEC (1st Gen)— dedicated hardware for video encoding/decoding accelerates streaming, recording, and video playback. Supported codecs: H.264,MPEG-2,VC-1.
| Specification | GeForce GT 645 |
|---|---|
| 0 PortsNumber of 0 display connectors | DVIx |
| 1 PortsNumber of 1 display connectors | HDMIx |
| 2 PortsNumber of 2 display connectors | DisplayPortx |
| Max DisplaysMaximum simultaneously connected monitors | 3 |
| Hardware EncoderVideo encoding engine version | NVENC (1st Gen) |
| Hardware DecoderVideo decoding engine version | NVDEC (1st Gen) |
| CodecsSupported video compression formats | H.264,MPEG-2,VC-1 |
Power & Dimensions
The GeForce GT 645 draws 32 Watt under load (TDP) — a 350W PSU minimum is recommended. Power connector: PCIe-powered. Physical size: 145mm long, 111mm tall, occupying 1 expansion slots, weighing 300g— verify your case has clearance before purchasing. Typical temperatures: 35 at idle, 80 under load.
| Specification | GeForce GT 645 |
|---|---|
| TDPPower consumption under load | 32 Watt |
| Recommended PSUMinimum power supply wattage | 350W |
| Power ConnectorRequired PCIe power cable type | PCIe-powered |
| Card LengthGPU card length — check case clearance | 145mm |
| Card Height | 111mm |
| Slot WidthExpansion slots occupied | 1-slot |
| Weight | 300g |
| Idle TemperatureTypical temperature at desktop idle | 35 |
| Load TemperatureTypical temperature under gaming load | 80 |
Value Analysis
At an average price of $15 (MSRP: $99), the GeForce GT 645 delivers 134 G3D Mark points per dollar. It holds Rank #242 in the cost-benefit ranking — a comprehensive score that weighs raw performance against current market pricing. Overall performance ranking position: #903 among all indexed GPUs.
| Specification | GeForce GT 645 |
|---|---|
| MSRPManufacturer's Suggested Retail Price | $99 |
| Avg Price (30d)Average market price over the last 30 days | $15 |
| Cost-Benefit RankOverall value ranking position | #242 |
| Performance RankPosition in global GPU performance ranking | #903 |
| Release Date | October 1 2012 |
| Release Year | 2012 |
Similar Performance
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AMD (12)
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Our Recommendation for GeForce GT 645
Suggested pairings based on performance balance
Minimum (Avoid Bottleneck) (12)
Recommended (Balanced) (12)
High-End (Max Performance) (12)
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