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8800gtx sli power requirements

My system with overclocked e8500 (4.2ghz) & SLI 8800gtx draws around 520watts max

(An overclocked q6600 (3.6ghz) will add about an extra 100watts...)

power-2.png
 
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lol thanks the only thing is i have a dell xps 720 and im not sure if i can use anythin else other than there psu :( im currently running 750w, i think that would be enough to power it however the two 6 pin connectors are being used
DSCF3642.jpg


any ideas how i would go sli ?
 
I'm in a similar position to yourself. My understanding is that you will need to get hold of an SLI bridge as Dell do not provide this connector. You will also need another adapter to convert a single PCI-E cable into two PCI-E cables, as you have probably realized the 750w PSU comes two and not four PCI-E cables required for SLI.
 
so sli should work with a bridge ?(anyone know where i can buy one besides dell) ...... by the way do you know if were limited so we have to use dells psu ?
 
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Think you're stuck with the Dell PSU alright as it uses proprietary connectors. To make things worse, the 1Kw version is supposed to be of very poor quality! I'd say a well known auction site is your best bet for acquiring the various parts.
 
according to dell

Power Supply:

750W (Black system) - SLI, ATX2.0, EPS12V, SSI industry compatibility

it cant be sli its two pins short :( will having a bridge allow me to go sli? if so will it affect the 8800gtx's performance ?
 
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people are getting very stressed about psus these days! Just because 2kw psus are available doesn't mean we actually need them.

In actual fact I'd be suprised if sli GTX and a quad drew more power than sli 6800 Ultra and a prescott?
 
Hello winngames, as others have stated, the Corsair HX 620W ATX2.2 Modular SLI Compliant PSUwill be absolutely fine running a dual Nvidia 8800 GTX system. It has been confirmed a number of times over at the Corsair forums - Clicky - Clicky.

At full load, a single 8800GTX will pull around 170 watts which equates to 14 amps. So two 8800GTX's in a system will equal to 28amps. Now, take the Intel Q6600 overclocked to 3.3GHZ which consumes around 150 watts which equates to 13 amps. Add a couple of hard drives rated at 1 amp each and then some for the extra head room. Now, this system is pulling around 45 amps of the 12 volt rail. The Corsair HX 620W is stated to have 50a on the +12V rail so the above system would be absolutely fine running on the Corsair HX 620W.

Now, I certainly wouldn't have any problem at all running the above system on the Corsair HX 620W ATX2.2 Modular SLI Compliant PSU. However, I can understand some people wanting a bit more headroom. If this is the case, then a power supply unit such as the Corsair TX 750W ATX2.2 SLI Compliant PSU, which has a rating of 60 amps on the 12 volt rail, will be absolutely fine and give you a little more headroom. :)
 
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thanks for the response :) however im not sure if i can buy another psu due to dells btx connector (see image above) if i cant upgrade my psu is there anyway i can still go sli by using a bridge for example, i only have 2 6 pin connectors and there both in 1 8800gtx i need another 2 6 pin connectors and if i cant upgrade my psu im stuck, will a bridge do the job and allow me to share the two connectors with another gtx?
 
Hello winngames, sorry I missed the rest of the thread. :(:p The image that you have provided looks like a standard ATX 24-Pin Power Connector that would be located on any motherboard. If someone could clarify that would be great..... :)

Now, in regards to using your current power supply unit - It may be worth contacting Dell and seeing if they will provide the extra power cables, providing they can, for a system that consists of dual Nvidia 8800 GTX. I'm pretty sure Corsair can provide cables for their Corsair HX 620W ATX2.2 Modular SLI Compliant unit for a dual Nvidia 8800 GTX/Ultra setup so hopefully Dell does the same.

Now, if Dell can't provide the correct power cables, your other option is the Akasa PCI Express 6-Pin to 4-Pin Power Adaptor for PCI-E Graphics Cards. Now, I am not sure if they will be adequate to you for what you are trying to do so once again if someone could clarify, that would be great.

If the above fails then I'm afraid you will need to purchase a new power supply unit. :)
 
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