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admin answers:

The Delta Electronics Inc. DPS-300AB 15B has a maximum power output of 300 Watts. The specifications are here:
https://www.newpowersupply.com/delta_dps_300ab_15b_300w_replacement_power_supply_w_sata_bulk_bestec_model_atx_300_12e__rev_d1r-pr-807-c-1-p-3.html
The 9800 GT requires at least a 400 Watt power supply. It is highly unlikely the 9800 GT will work with your existing power supply.
With a 300 Watt power supply, a good graphics card in the NVIDIA GeForce 9500 GT. It gets great reviews in all the trade magazines and websites I review, especially in bang for your buck. Here is a quick video review of the card:

If you REALLY want a 9800 GT, you would need to upgrade your power supply. That can be a little tricky to do – at least trickier than swapping a graphics card – but can be done.
There are even companies that sell direct replacements for the DPS-300AB 15B. Here is one such company:
http://www.atxpowersupplies.com/460-watt-power-supply-FSP460-60GLC.php
I’ve never used the retailer, so do so at your own discretion. FSP Group Inc (the maker of the power supply) isn’t a horrible name in power supplies, but they aren’t the greatest either. It should be fine.
I hope this helps. If you need more information, please add more details to this question, or feel free to email me through my Yahoo! Answers profile.
Good luck

admin answers:

Before you do anything check the dimensions of the power supply, some models of this dell 545 use a TFX power supply not a mini ATX (which is the one you have chosen)

Scan do a couple of TFX PSUs so these are likely more suitable, I would ring scan support line to confirm
HTH
David

admin answers:

No, it will not fit.
Your power supply looks like this: http://www.amazon.com/Bestec-TFX0250D5W-Power-Supply-Inspiron/dp/B001GJCR46
They are expensive because they are proprietary (made specially for Dell). The one I gave you a link to is only 250w, so you’ll need to find a larger wattage one (if one exists).

admin answers:

ATX

the model number for the system is SR2013WM and he following site has it cross referenced as an ATX: http://www.atxpowersupplies.com/300-watt-power-supply-bestec-atx-300-12ed.php?psu=ATX-300-12ED-SR2013WM

The listed power supply is 300W, I would get a higher wattage, perhaps 450W

admin answers:

I did a lot of web searching and the good news is that you do have a pcie x 16 slot. Also, the computer case is a mini-tower atx and motherboard looks like micro-atx.
The bad news is that the motherboard is crowded. The pci connectors next to the pcie are tall and other parts look in the way also. The case does not hold long cards and the power supply is either a 300 watt Bestec with 18A on 12V or a 350 watt that I could not find a label for that was often used with Quad Core cpus if it came with it.
This is the best views: http://www.youtube.com/watch?v=edfOHZJoOe0
and http://www.redplanettrading.com/ebay/desktops/case/inspiron546/s/s_motherboard_800.jpg
AMD Phenom II X4 945 is a 95 watt CPU of passmark score 3794
http://www.cpubenchmark.net/cpu_list.php
The computer case fan is not great, and is only one, and the motherboard capacitors are the cheap ones in what is now a 3 or 4 year old system. The aluminum capacitors on both the motherboard and power supply could be dying.

You would need a thin gpu card that is not too long and it may be best to be in low profile.
If you do not get a new computer case and completely re-build, top mounted power supplies have limited wattage abilities.
I cannot seem to find a top mounted power supply with more than 18A shown on 12V.
The 12V rail powers CPU, graphics, fans, disk drives.
You should turn off the system and unplug it and find the label on the power supply and show its information especially the +12V and whether there are any pcie 6 pin connectors.

My general feeling is that you should get a low profile HD 7750 or one that is thin.
Http://www.newegg.com/Product/Product.aspx?Item=N82E16814150612
8.3″ long, 4.4″ high, only 0.74″ thick
They will always say you need a 450 watt PSU, but for that I think you really need a new computer case for bottom mounting power supplies so you can buy a single rail 80 plus efficient decent one.
HD 7750’s do get their power from the PCIe slot with no auxiliary connect.
Most are 55 watts, though some could be overclocked or more memory at a higher wattage.
If you have a 95 watt CPU, 55 watts of GPU, 50 watts of fans and disk drive, then the total 200 watts watts is about 17 amps, pressing an 18A 12V to its limit, but if the PSU is 350 watts, maybe it has more than 18A available. You can use this site as shopping links:
http://pcpartpicker.com/

Your options:
1) An HD 7750 in a thin profile and pray the PSU is enough. If something fails, replace it.
2) Replace the power supply, and get a card that fits and it may be limited to HD 7750’s anyway.
3) Replace the case, power supply, and get a card that fits, and still could have motherboard interference even if improving air flow and available power.
4) scrap/sell and build new.
Browse through HD 7750’s:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&N=-1&isNodeId=1&Description=hd+7750

What it plays?
Http://www.anandtech.com/bench/Product/535
BF3 in high quality setings should get low 30’s fps.
SWTOR is better than that.
I think it makes a decent setting at low power.
A GTX 650 is similar and may get better play from BF3 in particular but that is 64 watts as slightly higher and you are stretching the psu to its limits. It also needs to fit on the motherboard.
Without a new case to get a bottom mounted power supply, every card is a risk in blowing it or not powering up.
Http://pcpartpicker.com/parts/video-card/#c=115,80&sort=a5
This Galaxy is a nice card at a good price, but can you fit the 1.5″ thick without interfering?
Http://www.newegg.com/Product/Product.aspx?Item=N82E16814162124
It needs a PCIe 6 pin connector and probably is over 75 watts.