T430S - need help outputting 4k resolution

I just acquired a Seiki 39" 4k resolution monitor (SE39UY04). Intel 4000 graphics support 4k resolution. Displayport 1.4 (as equipped on the T430s) supports 4k (at 30 hz). I have approved displayport to hdmi converter, and a 4k enabled hdmi cable that came with the screen.
I cannot figure out how to enable 4k resolution. I even tried forcing it in the Intel driver app, but I'm told the settings exceed available bandwidth. I set refresh all the way to 24 (the lowest valid number). Color depth is fixed at 32 bit - cutting that in half would certainly help, but I can't seem to change that (32bit is the only option in the drop down).
Any suggestions for getting 3840 x 2160 @ 30 hz? I don't need more than 16bit color depth if that helps. 
My target is business applications, no games or 3D. Just big spreadsheets and lots of multitasking.
Thanks!

http://www.amazon.com/Seiki-Digital-SE39UY04-39-Inch-Ultra/dp/B00DOPGO2G
if you read the spec, the 4K@30hz is only supported through HDMI, it requires a HDMI 1.4 to be exact. Lenovo ThinkPad T430s/T430 DP don't support hdmi 1.4, which is why you couldn't get it to work.
But the DP 1.1 definitely can support 4K resolution (correction: DP 1.1 can only support 4K @ 30 hz or less), which is why the displayport splitter works.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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