Detailed differences between Pubstack & Acquia

PHP Modules	pubstack	Acquia
PHP-FPM	v5.5.12	v5.5.11
APCu Support	v4.0.4	v4.0.2
OpenSSL	v1.0.1	v0.9.8k
ZLib Version	v1.2.3.4	v1.2.3.3
libxml	v2.7.8	v2.7.6
GD Version	2.1.1-dev	v2.1.0
libJPEG	v8	v6b
Memcached	1.4.13	1.4.5
PECL Memcache	3.0.8 (rev 329835)	3.0.8 (rev 329835)

Apache Modules	pubstack	Acquia
Apache	v2.4.9	v2.2.14