GPU difference on Dell Studio XPS 1645

I remember when I first got my Refurbished Dell Studio XPS 1645 (due to problems with Dell XPS M1530) I had a GPU with the name "ATI Mobility Radeon HD 565v"


when I went through many problems with my computer and motherboard replacements by dell, I noticed my GPU was replaced with "ATI Mobility Radeon HD 4670"


What difference between ATI Mobility Radeon HD 4670 and ATI Mobility Radeon HD 565v?

 

Mobility Radeon HD 4600 Series
Mobility Radeon HD 4670 320 @ 675MHz 128 Bit @ 800MHz

Mobility Radeon HD 4650
320 @ 550MHz 128 Bit @ 800MHz

Codename M96-XT
Architecture Terascale 1
Pipelines 320 - unified
Core Speed * 675 MHz
Shader Speed * 675 MHz
Memory Speed * 800 MHz
Memory Bus Width 128 Bit
Memory Type GDDR3, DDR2, DDR3
Shared Memory no

DirectX DirectX 10.1, Shader 4.1
Power Consumption 35 Watt
Transistors 514 Million
technology 55 nm
Features OpenGL 2.0, PCI-E 2.0 x16, Powerplay, DisplayPort support up to 2560x1600, HDMI support up to 1920x1080 (both with 7.1 AC3 Audio), 1x Dual-Link/Single-Link DVI, 1x Single-Link DVI Support (all display ports have to be supported by the laptop manufacturer)
Notebook Size medium sized
Date of Announcement 09.01.2009

 

Mobility Radeon HD 560v Series
Mobility Radeon HD 565v 320 @ 675MHz 128 Bit @ 800MHz

Mobility Radeon HD 560v
320 @ 550MHz 128 Bit @ 800MHz

Architecture Terascale 1
Pipelines 320 - unified
Core Speed * 675 MHz
Shader Speed * 675 MHz
Memory Speed * 800 MHz
Memory Bus Width 128 Bit
Memory Type GDDR3, DDR3, DDR2
Shared Memory no

DirectX DirectX 10.1, Shader 4.1
Transistors 514 Million
technology 55 nm
Notebook Size medium sized
Date of Announcement 05.05.2010

 

Both look the same

 

So my guess was correct then. Thanks for the clarification dave-p ^_^