DDR2 800 versus DDR3 1333

I am planning on upgrading my current gaming computer that has a peculiar bug that prevents the ram from running at it's rated 1066 speed and will only run at 800 (2x 400).
Old Specs
Q9550 2.83GHz
4Gb DDR2 1066 5-6-6-18 2.2v (only runs 800 5-5-5-15 2v)
Asus P5QL-Pro
500 Watt PSU
200Gb Sata HDD Boot/ 1Tb Green Data Drive

P5QL-Pro - http://www.newegg.com/Product/Product.aspx?Item=N82E16813131329

GSkill DDR2 Ram - http://www.newegg.com/Product/Product.aspx?Item=N82E16820231241
MSI G41M-P23 - http://www.newegg.com/Product/Product.aspx?Item=N82E16813130305

Gskill 8Gb DDR3 - http://www.newegg.com/Product/Product.aspx?Item=N82E16820231311

I want to make sure that the old bottleneck of the ram, wondering if the ~$100 upgrade will be worth it.
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More about ddr2 versus ddr3 1333
  1. What are your expectations? You won't be able to notice the performance difference unless you run benchmarks.
  2. Was hoping to see a gaming performance boost, the Q9550 and GTX260 both are decent parts, but I was hoping the upgrade of RAM would help twofold, with more capacity (4Gb->8Gb) and be faster running (DDR2->DDR3), so I was expecting a gaming performance increase in games like WoW
  3. If memory utilization is very close to 4 GB, then more memory will help. DDR2-800 on a P43 motherboard will perform almost as fast as DDR3-1333 on a G41 motherboard. You can expect a performance gain of 0-3%. It will be a bit more if your system really needs more than 4 GB.
  4. Darn, I was hoping it would be more pronounced than that. Gosh, that makes me wonder if it's even worth it to do the upgrade.
  5. You need to understand that faster memory also has higher latencies. This article may be of interest: http://ixbtlabs.com/articles3/cpu/ddr2-800-vs-ddr3-1333.html They used slightly faster processors along with a much better motherboard than you plan on using for DDR3 memory.
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