GeForce GT 640 OEM vs ATI Radeon HD 3850

Place in the ranking	1104	935
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.04	no data
Power efficiency	0.93	2.33
Architecture	TeraScale (2005−2013)	Kepler (2012−2018)
GPU code name	RV670	GK107
Market segment	Desktop	Desktop
Release date	19 November 2007 (17 years ago)	24 April 2012 (12 years ago)
Launch price (MSRP)	$179	no data

Cost-effectiveness evaluation

Performance to price ratio. The higher, the better.

no data

Detailed specifications

General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.

Pipelines / CUDA cores	320	384
Core clock speed	668 MHz	797 MHz
Number of transistors	666 million	1,270 million
Manufacturing process technology	55 nm	28 nm
Power consumption (TDP)	75 Watt	50 Watt
Texture fill rate	10.69	25.50
Floating-point processing power	0.4275 TFLOPS	0.6121 TFLOPS
ROPs	16	16
TMUs	16	32

Form factor & compatibility

Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).

Interface	PCIe 2.0 x16	PCIe 3.0 x16
Length	208 mm	145 mm
Width	1-slot	1-slot
Supplementary power connectors	1x 6-pin	None

VRAM capacity and type

Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.

Memory type	GDDR3	DDR3
Maximum RAM amount	1 GB	2 GB
Memory bus width	256 Bit	128 Bit
Memory clock speed	830 MHz	891 MHz
Memory bandwidth	53.12 GB/s	28.51 GB/s

Connectivity and outputs

Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.

Display Connectors	2x DVI, 1x S-Video	1x DVI, 1x HDMI, 1x DisplayPort
HDMI	-	+

API compatibility

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX	10.1 (10_1)	12 (11_0)
Shader Model	4.1	5.1
OpenGL	3.3	4.6
OpenCL	N/A	1.2
Vulkan	N/A	1.1.126
CUDA	-	3.0

Gaming performance

Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.

Pros & cons summary

Performance score	1.02	1.70
Recency	19 November 2007	24 April 2012
Maximum RAM amount	1 GB	2 GB
Chip lithography	55 nm	28 nm
Power consumption (TDP)	75 Watt	50 Watt

GT 640 OEM has a 66.7% higher aggregate performance score, an age advantage of 4 years, a 100% higher maximum VRAM amount, a 96.4% more advanced lithography process, and 50% lower power consumption.

The GeForce GT 640 OEM is our recommended choice as it beats the Radeon HD 3850 in performance tests.

Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.