Cache Size Impact on Performance
As we continue to look at the Athlon 64 platform with respect to Half Life 2 performance it's now time to find out how much benefit the 1MB L2 Athlon 64s gain over the 512KB L2 parts.
Given that we've already shown Half Life 2 to be sensitive to both memory bandwidth and latency on the platform, we wouldn't be too surprised to see some pretty big differences between 512KB and 1MB L2 Athlon 64 processors.
at_canals_08 |
at_coast_05 |
at_coast_12 |
at_prison_05 |
at_c17_12 |
|
1MB L2 |
116.69 |
134.45 |
121.67 |
118.51 |
80.39 |
512KB L2 |
111.56 |
126.2 |
117.35 |
115.75 |
74.14 |
With a performance advantage as large as 8%, the 1MB Athlon 64s (and Athlon 64 FXs) do surprisingly well under Half Life 2 when compared to their normally competitive 512KB counterparts. While 8% alone isn't much, combine that with the advantage of a 128-bit DDR memory bus and the Socket-939 Athlon 64 platform can offer a reasonably high performance improvement over even the Socket-754 solutions.
SSE/SSE2 Impact on Performance
Just for kicks we turned off the Athlon 64's SSE/SSE2 instruction set support to see if that impacted performance in any way:
at_canals_08 |
at_coast_05 |
at_coast_12 |
at_prison_05 |
at_c17_12 |
|
SSE/SSE2 Enabled |
116.12 |
140.43 |
123.37 |
113.69 |
83.15 |
SSE/SSE2 Disabled |
117.64 |
140.94 |
125.85 |
116.55 |
82.56 |
Despite minor variations in performance, it doesn't look like SSE/SSE2 is doing much for the Athlon 64 under Half Life 2. We just had to fulfill our curiosities.
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Phantronius - Wednesday, January 26, 2005 - link
#3NF4 will not be supporting AGP bud, sorry, its PCI-E from here on out.
Ozz1113 - Wednesday, January 26, 2005 - link
Ill backup the thought of putting some T-bred cores in there. My OC'd XP2600 333 w\ modded 9500 radeon system ran HL2 very well. I would have liked it to have been better, but it is not worth upgrading yet.Araemo - Wednesday, January 26, 2005 - link
Hehehe.. I'll fifteenth the "Please include an AXP3200+" sentiment. Personally, I'd rather see one or two AXPs included than a complete list of athlon64s.. You can generally extrapolate the performance of a given CPU if you are given two other CPUs with the same cache/FSB/core. I know that my Mobile barton handled the game fine, but I'd like to know how far behind a cheap A64 it really is.miketheidiot - Wednesday, January 26, 2005 - link
"Our standard 2-2-2-10 memory does actually offer reasonable performance benefits in Half Life 2 compared to DDR400 with higher timings such as 3-3-3-10 or the unrealistically high 3-6-6-10."Reasonable performance benefits? decent 2.5-3-3-10 ram can be found cheap nowdays (http://www.newegg.com/app/ViewProductDesc.asp?desc... and compared to the oczrev2 and other $200+ modules is at least $60 cheaper, in some case as much as $100 cheaper. The 2-2-2 is only 2% faster than the 3-3-3, so does that extra $60+ really offer "reasonable performance benefits"?
Jeff7181 - Wednesday, January 26, 2005 - link
#13... I wouldn't call that an error, I'd call that a difference in opinion. :)PrinceGaz - Wednesday, January 26, 2005 - link
There seems to be an error on page 4- "Almost all DDR400 these days is CAS 2 memory, but older memory may have a higher CAS latency..."Shouldn't it say "Almost all DDR400 tested by AnandTech is premium CAS 2 memory, but CAS 2.5 and CAS 3 are more common..."
Aquila76 - Wednesday, January 26, 2005 - link
What about SLI configs? I think people looking SLI for an option may want a better idea how their CPU choice affects the dual GPU choice. Can you add SLI'd 6600GT, 6800GT, 6800 Ultra benches to the tables at the end of your article?Tiamat - Wednesday, January 26, 2005 - link
Yeah, although probably unrealistic, tossing AXP's into a "low end range" comparison along side would help some people. Overall, great article!Regs - Wednesday, January 26, 2005 - link
I liked the Ram latency and 64-bit/128-bit test. But I'm wondering how would 2.5 Cas would perform? Makes sense to list it since a lot of value named brand ram modules come with 2.5 CAS. I would think it would perform in-between the two, but I'm having the slightest inkling that 2.5 CAS and 2.0 CAS will perform the same.Can't wait to hear about multithreaded games for dual core CPUs.
Jeff7181 - Wednesday, January 26, 2005 - link
Well we can look at the other HL2 articles cause there's an XP3200 in those... but... this being a CPU oriented article I thought it would be nice to have that CPU included. Possibly even an XP3000 so we can get an idea for how it scales so I can estimate how my 2.48 GHz Mobile AXP compares.