Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


3328 posts

Uber Geek
+1 received by user: 559

Lifetime subscriber

Topic # 21214 19-Apr-2008 13:26
Send private message

As the on board X1250 graphics of the ASUS M2A-VM HDMI motherboard weren't quite hacking the pace on TV3 DVB-T (75% CPU load) I took the advice of various geekzone threads and installed an HDMI capable video card.  Firstly the ATI 3450, once installed it produced huge blocky artifacts and horrible noises so I uninstalled it and took it back, I noted that Nvidia cards were suggested on some threads.  Waiting a couple of weeks I installed a Leadtek 8500GT and the same problem immediately appeared again.  But when I played some TS. files recorded with onboard graphics only they were smooth and clear.

When I forced the second HVR-3000 to operate as the primary card it was clear as a bell, and the picture smooth.  It was only then I twigged to the fact that the layout of this particular motherboard puts the PCI-Ex videocard's processor etc about 5mm (or less) from the tuner circuitry on the HVR-3000 in the No1 PCI slot.  And that the No1 HVR-3000 screens the No2 HVR-3000 (in PCI slot 2 right next door) from the video card. To test the theory that EM interference from the videocard was the issue I built an EM shield by sandwiching tinfoil between two layers of insulating plastic and placing it between the videocard and the No1 HVR-3000 (being careful about cooling flows).  And the interference vanished.

So I post this as a word of warning to potential HTPC builders.  Look carefully at the location of PCI-Ex and PCI slots if you are going the multi-tuner route.  The M2A-VM HDMI is a micro-ATX board with the slots all close together, and with the benefit of hindsight an ATX board may have been a better bet (like an idiot I bought a 'nice' looking case first - for WAF - only to realise it was a micro-ATX, which limited my choices from then on).




Areas of Geek interest: Home Theatre, HTPC, Android Tablets & Phones, iProducts.

Create new topic
722 posts

Ultimate Geek


  Reply # 124953 19-Apr-2008 17:25
Send private message

Dingbatt: As the on board X1250 graphics of the ASUS M2A-VM HDMI motherboard weren't quite hacking the pace on TV3 DVB-T (75% CPU load) I took the advice of various geekzone threads and installed an HDMI capable video card.  Firstly the ATI 3450, once installed it produced huge blocky artifacts and horrible noises so I uninstalled it and took it back, I noted that Nvidia cards were suggested on some threads.  Waiting a couple of weeks I installed a Leadtek 8500GT and the same problem immediately appeared again.  But when I played some TS. files recorded with onboard graphics only they were smooth and clear.

When I forced the second HVR-3000 to operate as the primary card it was clear as a bell, and the picture smooth.  It was only then I twigged to the fact that the layout of this particular motherboard puts the PCI-Ex videocard's processor etc about 5mm (or less) from the tuner circuitry on the HVR-3000 in the No1 PCI slot.  And that the No1 HVR-3000 screens the No2 HVR-3000 (in PCI slot 2 right next door) from the video card. To test the theory that EM interference from the videocard was the issue I built an EM shield by sandwiching tinfoil between two layers of insulating plastic and placing it between the videocard and the No1 HVR-3000 (being careful about cooling flows).  And the interference vanished.

So I post this as a word of warning to potential HTPC builders.  Look carefully at the location of PCI-Ex and PCI slots if you are going the multi-tuner route.  The M2A-VM HDMI is a micro-ATX board with the slots all close together, and with the benefit of hindsight an ATX board may have been a better bet (like an idiot I bought a 'nice' looking case first - for WAF - only to realise it was a micro-ATX, which limited my choices from then on).


That is very well diagnosed. Congrads. I do believe that when it comes to electronics, more [room] is better. What now: a premanent EM shield?




Silverstone LC14 HTPC Case/Intel E4600 CPU/GA-EP35-DS3 MOBO/Asus EN9500GT graphics/2GB RAM/total 2TB HDD space/HVR-2200 & 2X 150MCE tuner cards/LG GGC-H20L BD Drive/MCE2005/Mediaportal/TVServer 1.1.0Final/LG 55"3D LED-TV/Denon AVR-1803 receiver/X1 projector



3328 posts

Uber Geek
+1 received by user: 559

Lifetime subscriber

  Reply # 124957 19-Apr-2008 17:55
Send private message

1gkar:

That is very well diagnosed. Congrads. I do believe that when it comes to electronics, more [room] is better. What now: a premanent EM shield?


Yes I only figured it out last night and have left the machine running all day while the the Hamilton V8s are on to check on how the plastic handles the heat and there are no other cooling issues. Then figure out how to fix the shield in the case.  The 8500GT certainly make a difference, the CPU is sitting around 10% now, although I'm kicking myself that I shot the ATI 3450 back so quickly because it was 50 bucks cheaper and probably would have worked okay.

The set up above will probably stay like that for a while.  As well as connecting to the Plasma, it is networked using mediaportal TV-server to a couple of PCs.  The system seems to work well, so the tuner cards will probably end up in a purpose built mediaportal (or Vista MC - if MS ever get it right) server made with an ATX mobo in an ATX case.




Areas of Geek interest: Home Theatre, HTPC, Android Tablets & Phones, iProducts.

Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Microsoft Dynamics 365 Business Central launches
Posted 10-Jul-2018 10:40


Spark completes first milestone in voice platform upgrade
Posted 10-Jul-2018 09:36


Microsoft ices heated developers
Posted 6-Jul-2018 20:16


PB Technologies charged for its extended warranties and warned for bait advertising
Posted 3-Jul-2018 15:45


Almost 20,000 people claim credits from Spark
Posted 29-Jun-2018 10:40


Cove sells NZ's first insurance policy via chatbot
Posted 25-Jun-2018 10:04


N4L helping TAKA Trust bridge the digital divide for Lower Hutt students
Posted 18-Jun-2018 13:08


Winners Announced for 2018 CIO Awards
Posted 18-Jun-2018 13:03


Logitech Rally sets new standard for USB-connected video conference cameras
Posted 18-Jun-2018 09:27


Russell Stanners steps down as Vodafone NZ CEO
Posted 12-Jun-2018 09:13


Intergen recognised as 2018 Microsoft Country Partner of the Year for New Zealand
Posted 12-Jun-2018 08:00


Finalists Announced For Microsoft NZ Partner Awards
Posted 6-Jun-2018 15:12


Vocus Group and Vodafone announce joint venture to accelerate fibre innovation
Posted 5-Jun-2018 10:52


Kogan.com to launch Kogan Mobile in New Zealand
Posted 4-Jun-2018 14:34


Enable doubles fibre broadband speeds for its most popular wholesale service in Christchurch
Posted 2-Jun-2018 20:07



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.