BT848 doesnt support 'sustained' 640x480

[FuriousGeorge]

I noticed that my 8 chip card was advertised as 240fps / 8 chips @ 320x240.

I assumed I would be able to do around 7fps at 640x480, but when I contacted the manufacturer about it, he said that the card didnt support 640x480 for 'sustained periods'.

I know that other bt848-based cards claim they can do 640x480, and that wording made me think that maybe heat dissipation (or lack there of) was the problem. The person at the other end of the support line doesn't seem technical enough to field my question, so I thought I'd ask here.

Is it possible with some heatsinks and maybe a well placed fan I could reliably sustain 640x480? This may be card=97, but card=0 is working, so I let sleeping dogs lie for now.

I understand this would void my warranty

[Lee Sharp]

I put heat sinks on all mt bt878 chips. Those suckers run hot. It has fixed a lot of stability problems...

[xjust]

where did you get the heatsinks ? thanks

[curtishall]

where did you get the heatsinks ? thanks

http://store.bluecherry.net/product_p/ez-bcc9.htm

Click on the Bluecherry store link above in 'Shop (http://store.bluecherry.net/SearchResul ... 3&Click=51)' so your order is tagged with the affiliate tracking code so Zoneminder gets a portion of the sale.

Thanks

[DREMA]

Yeap, those chips NEED the heat sinks.

On an older setup I got eight cameras working at 640x480@~20fps, with the heatsinks and some fans.

On a recent setup, my vendor run out of heatsinks and I cannot run the camera at that settings 'cause it frezees the machine. And all indicates that the over heating is the cause.

So get those heatsinks and make some tests.

[skyking]

Heatsinks, and I installed a fan in front of the card as well. Coincidentally the fan is behind the disk drives and cools them as well.
hddtemp shows the drives at 30 and 32 degrees, very healthy.