You are confusing the discrete 9400 GS/GT GPU core (G96) with the motherboard chipset/IGP called 9300M/9400M G/9400M GS (MCP79).
The later have dual-channel (128bit) memory support for either DDR2 or DDR3 memory.
Nvidia 9400M in new Apple notebooks
- Thread starter Zengar
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You are confusing the discrete 9400 GS/GT GPU core (G96) with the motherboard chipset/IGP called 9300M/9400M G/9400M GS (MCP79).
The later have dual-channel (128bit) memory support for either DDR2 or DDR3 memory.
I was refering to the information provided on the nvidia website.
9400M – http://www.nvidia.com/object/product_geforce_9400m_g_us.html
9300M – http://www.nvidia.com/object/product_geforce_9300m_g.html
The bus width is supposed to mean the GPU memory interface width.
I am unsure what the performance relation to the desktop IGP will be.
Nope, look closer:
9400M G - "Memory Interface: 128bit"
9300M mGPU - "DDR Support: Dual DDR3-1333"
Nvidia giving two different looking spec sheets for basically the same chip donned with different clocks and product numbers is a mystery to me, but the essential info is there nevertheless.
The 9400M doesn't have dedicated memory or "Sideport Memory" schemes like AMD's 780G/790GX, so any it uses must come from main system RAM.
The spec is correct, both the 9300M and the 9400M support Dual-channel RAM (a.k.a., "128bit" memory bus), because actual differences between them are their respective clockspeeds.
Nothing else.
What you say makes sense
But, look at the specs sheet of 9300M at http://www.nvidia.com/object/geforce_9300m_g.html
It clearly states "64-bit memory interface". A mistake?
But, look at the specs sheet of 9300M at http://www.nvidia.com/object/geforce_9300m_g.html
It clearly states "64-bit memory interface". A mistake?
Look at the maximum amount of RAM (256MB) and speed (600MHz-> 1200MHz GDDR3, instead of DDR3-1066/1333), shader clock (800MHz, while the 9300M IGP runs them at 1.2GHz), etc.
That's the page of a discrete GPU called "9300M G" (G98, i believe), not of the IGP with -almost- the same name (9300M mGPU).
Nvidia should have gone with "9100" and "9200" for the naming scheme of these new IGP's, this is just too confusing for those not in the know...
the latest MacBook Pro has caught my attention because i'm in the market to purchase a notebook within the next three months. i'm keen to see real-world benchmarks of the 9400M. after more than six (6) years away from software development i'm looking forward to getting back 'to the editor' amd see how things have changed since the turn of century.
BareFeats have several mini-reviews up comparing the new MacBook Pro with the Geforce 9400M and the Geforce 9600M GT.
3D Graphics Benchmarks
CPU Crunch Benchmarks
GPU Comparison
Gizmodo's Macbook/Pro review has videos of both laptops running Spore (in the Pro's case, both with the 9600 and with the IGP).
Lenovo T400 or T500 are a much much better value, outstanding battery life on the 400 and LED screen option, and both have hybrid switchable graphics (runs intel x4500 by default and you can enable ATI when you need it in real time). The radeon 3670 in the t500 is one of the faster gpus in sub-17'' laptops, I prefer nvidia but apparently they weren't compatible with the hybrid graphics. Search for the CPP (contractor purchase program) code and you will get a massive discount, a fully pimped out T series can be bought for ~$1000
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