New board from Intel (D945GSEJT)

[theonlykid]

Here is a link to the specs for the JT
http://download.intel.com/support/mo...62862001us.pdf

The power specs are on pgs 55/56. It is pretty hard to hit a 4A draw on this board.

[Fiberoptic]

Here is the relevant section of the manual on the d945gsejt Maximum load. I disagree with their numbers. Documentation below after specs.


(from page 55 and 56 of http://download.intel.com/support/motherboards/desktop/d945gsejt/sb/e62862001us.pdf)

Maximum load refers to the incremental power demands placed on the power supply,
augmenting the minimum load configuration into a fully-featured system that stresses
power consumption from all subsystems. Maximum load configuration test results are
shown in Table 32. The test configuration was defined as follows:
• 2 GB DDR2/533 MHz SO-DIMM
• 20-inch LCD display through DVI-D port
• SATA DVD-R/W
⎯ Load: DVD playback
• 3.5-inch SATA hard disk drive, running Microsoft Windows Vista Home Basic
⎯ Load: continuous read/write benchmark
• 2.5-inch PATA hard disk drive
⎯ Load: continuous read/write benchmark
• Intel Z-U130 USB Solid-State Drive (or compatible device) on the USB flash drive
header
⎯ Load: continuous read/write benchmark
• Wireless card on PCI Express Mini Card slot, connected via 802.11n protocol
⎯ Load: continuous read/write benchmark on remote share
• Riser card on conventional PCI slot, populated with third-party modem and disk
encryption add-in cards
• USB keyboard and mouse
• Back and front panel host-powered USB devices (other than keyboard and mouse)
at or near 500 mA
⎯ Load: continuous read/write activity on external drive/peripheral
• LAN linked at 1 Gbps
⎯ Load: continuous read/write benchmark on remote share
• All on board peripherals enabled (serial, parallel, audio, …)

Table 32. Maximum Load Configuration Current and Power Results
Subsystem Current Draw at 12 V Power Consumption
Minimum Load Configuration 1.02 A 12.28 W
SATA DVD-R/W 0.29 A 3.48 W
3.5-inch SATA hard disk drive 0.525 A 6.24 W
2.5-inch PATA hard disk drive 0.3 A 3.6 W
Intel Z-U130 USB Solid State Drive
(or compatible device)
0.31 A 3.72 W
Wireless PCI Express Mini Card 0.15 A 1.8 W
PCI cards on riser 0.19 A 2.28 W
Host-powered USB devices (other
than keyboard and mouse)
0.72 A 8.64 W

Maximum Load Configuration 3.505 A 42.04 W

I don't agree with intel's math. They should really drop the z-u130 and plan for the KB and mouse to be on a hub and have maximum load on all 7 usb ports for their calculation. This alone would be 3.5 amps.

Intel's team is under a lot of preasure to provide a green, high ratio of "computing cycles per watt". I wonder if this preasure lead them to stretch the specs a bit to keep it in the ~40 watt range.

[theonlykid]

A typical keyboard draws 100mA and a mouse is about 20mA, so how does that take it above 4A?

[Fiberoptic]

A typical keyboard draws 100mA and a mouse is about 20mA, so how does that take it above 4A?

If you put the keyboard and the mouse on a hub with another device that also draws 350mA that would make that one port max out at ~500mA. It is a stretch, but if you REALLY want to plan for maximum load at least 4amps if not 5 would be prudent.

[HiJackZX1]

If you put the keyboard and the mouse on a hub with another device that also draws 350mA that would make that one port max out at ~500mA. It is a stretch, but if you REALLY want to plan for maximum load at least 4amps if not 5 would be prudent.

It really all depends. Every last one of my hubs is powered by an external power source, so no power draw would really be pulled from the MoBo. With all the power hungry devices the Car PC uses now a days, I cant really imagine many people use non powered hubs. Also my understanding is that if a hub is rated at 3.5 amps, but the USB port on the MoBo is 500ma, then all that hub will be able to pull is 500ma (which you mentioned above Fiberoptic), that is the reason they make the hub with a external power connector. I think if people are interested in this board and have alot of devices, they should make sure the hub is powered and limit how many on board USB ports they use. On my setup with these boards, I am only planning on using 2 ports. One for the KVM switch, which is where the mouse and keyboard are plugged into. The KVM units get their power from a 7 port hub, which is powered by a separate power supply. The other thing that is connected is a USB port for devices like thumb drives, controllers, ipods and what not. That should keep the setup at about 12V at 2 amps or less.

[Chris_A31]

I see this board has only 1 audio port. How would I go about connecting this to say.. a 4ch amp and also a monobloc?? (not sure about the audio pins on the board?)

[Fiberoptic]

I see this board has only 1 audio port. How would I go about connecting this to say.. a 4ch amp and also a monobloc?? (not sure about the audio pins on the board?)

There are a bunch of audio headers on the motherboard itself. Check the manual for details. I know spdif output is one option.

[tbird2340]

So what is the absolute cheapest / safest way to power this in a vehicle?

[HiJackZX1]

So what is the absolute cheapest / safest way to power this in a vehicle?

Im curious about this too. I have six of these to power. I was going to use two M4-ATX units, 3 boards per PSU. This board needs regulated power going in, so what can we use?

Also what do we do about shut down and start up? Like with the cars ignition? i was going to use EWF and HORM, but I am sure not everyone wants to go this route.

[Fiberoptic]

Im curious about this too. I have six of these to power. I was going to use two M4-ATX units, 3 boards per PSU. This board needs regulated power going in, so what can we use?

Also what do we do about shut down and start up? Like with the cars ignition? i was going to use EWF and HORM, but I am sure not everyone wants to go this route.

We are using the P2140 in this video

[media]http://vimeo.com/5938715[/media]